I mean, back when MLP was the top gallery, I could understand. But now that it's sorta declining in popularity, it doesn't really have a use.
Heck, a better option would be gallery/tag filters, so you never see anything tagged with specific tags on your profile, hidden privately, of course.
If I entered to hide the tag "unfunny", it'll never show any images tagged so.
Whadda think, would that be better than having a button for 1 specific galley, or no?