Site features that you miss

Ciaran
ラ・ゼッタ - For supporting the site
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Shimmering Smile - Celebrated the 10th anniversary of Equestria Girls!
Lunar Guardian - Earned a place among the ranks of the most loyal New Lunar Republic soldiers (April Fools 2023).
Crystal Roseluck - Had their OC in the 2023 Derpibooru Collab.
Flower Trio - Helped others get their OC into the 2023 Derpibooru Collab.
A Lovely Nightmare Night - Celebrated the 12th anniversary of MLP:FIM!
Princess of Love - Extra special version for those who participated in the Canterlot Wedding 10th anniversary event by contributing art.
Tree of Harmony - Drew someone's OC for the 2022 Community Collab
Elements of Harmony - Had an OC in the 2022 Community Collab

Senior Moderator
友情は魔法だ
@byte[]  
What was the tool called that showed us running streams so we could watch to make sure jobs finished before starting new ones? I can’t recall, but I really miss it sometimes.
Icicle Niceicle 1517
Stormfeather - For supporting the site
Strawberry Sunrise - For Patreon supporters
Tempest & Elizabat - Derpi Supporter
Artistic Detective - For awesome dedication to sleuthing out and maintaining artist tags and links
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Shimmering Smile - Celebrated the 10th anniversary of Equestria Girls!
Lunar Champion - Led the charge of major battles for the New Lunar Republic, bringing swift and crushing defeat to the forces of the Solar Empire (April Fools 2023).
Flower Trio - Helped others get their OC into the 2023 Derpibooru Collab.
Crystal Roseluck - Had their OC in the 2023 Derpibooru Collab.
King Sombra - Celebrated the 10th anniversary of The Crystal Empire!

Ocs,Boops,Tickles&Memes
Not sure if this counts, but i remember back in the early years when the site first started out it would be snowing on the site whenever it was December t try and get into the festive spirit.
 
That was nice, i miss that
P3FOYFN

I’d like the most popular images feature to return under the Activity menu. The one that showed the most upvoted or active images from the past week or so.
𝐒𝐞𝐚𝐫
Silly Pony - Celebrated the 13th anniversary of MLP:FIM, and 40 years of MLP!
Thread Starter - Started a thread with over 100 pages
Shimmering Smile - Celebrated the 10th anniversary of Equestria Girls!
Lunar Guardian - Earned a place among the ranks of the most loyal New Lunar Republic soldiers (April Fools 2023).
Flower Trio - Helped others get their OC into the 2023 Derpibooru Collab.
Roseluck - Had their OC in the 2023 Derpibooru Collab.
King Sombra - Celebrated the 10th anniversary of The Crystal Empire!
A Lovely Nightmare Night - Celebrated the 12th anniversary of MLP:FIM!
Princess of Love - Extra special version for those who participated in the Canterlot Wedding 10th anniversary event by contributing art.
Tree of Harmony - Drew someone's OC for the 2022 Community Collab

seventh layer of hair
I miss the post count that’s visible below your avatar. Also the accumulated total number of posts in a single day showing on a bar when you point your mouse on it or click it through mobile device on the statistics of your profile.
Background Pony #0B86
I miss a deviantArt scraper that auto-fills the description.  
Of course, that might be out of our control.
Background Pony #CC50
@PUBLIQclopAccountant
How about userstyle? eg. the browser extension “Stylus”
.interaction--fave .fa,
.interaction--upvote .fa,
.interaction--downvote .fa,
.interaction--comments .fa,
.interaction--hide .fa {
	color: transparent;
	vertical-align: bottom;
	width: 20px; height: 20px;
}

.image-metabar .interaction--fave .fa,
.image-metabar .interaction--upvote .fa,
.image-metabar .interaction--downvote .fa,
.image-metabar .interaction--comments .fa,
.image-metabar .interaction--hide .fa {
	width: 30px; height: 30px;
}

.interaction--fave .fa,
.interaction--upvote .fa,
.interaction--downvote .fa,
.interaction--comments .fa {
	background-image: url("https://derpicdn.net/img/2017/4/1/1401039/thumb_small.png");
	background-size: 206% 206%;
}

.interaction--fave .fa,
.interaction--upvote .fa {
	transform: scaleX(-100%);
}

.interaction--fave .fa { background-position: bottom left; }
.interaction--upvote .fa { background-position: top left; }
.interaction--downvote .fa { background-position: top right; }
.interaction--comments .fa { background-position: bottom right; }

.interaction--hide .fa {
	background-image: url("https://derpicdn.net/img/2018/3/19/1684973/thumb_small.png");
	background-position: top right;
	background-size: 180% 180%;
}
Pointy pony variant:
.interaction--fave .fa,
.interaction--upvote .fa,
.interaction--downvote .fa,
.interaction--comments .fa {
	color: transparent;
	vertical-align: bottom;
	width: 20px; height: 20px;
	background-position: top left;
	background-size: 160% 160%;
}

.image-metabar .interaction--fave .fa,
.image-metabar .interaction--upvote .fa,
.image-metabar .interaction--downvote .fa,
.image-metabar .interaction--comments .fa {
	width: 30px; height: 30px;
}

.interaction--fave .fa,
.interaction--upvote .fa {
	transform: scaleX(-100%);
}

.interaction--fave .fa { background-image: url("https://derpicdn.net/img/2017/1/17/1341614/thumb_small.png"); }
.interaction--upvote .fa { background-image: url("https://derpicdn.net/img/2017/1/17/1341613/thumb_small.png"); }
.interaction--downvote .fa { background-image: url("https://derpicdn.net/img/2017/1/17/1341611/thumb_small.png"); }
.interaction--comments .fa { background-image: url("https://derpicdn.net/img/2017/1/17/1341610/thumb_small.png"); }
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Ministry of Image - Fanfiction Printing

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