Thread Ignore is a god-send. I'm using it pretty frequently, mostly on stuff I simply don't give a shit about. Especially speculation threads about games or movies that are not out yet, because nobody knows anything and it's just one step removed from empty fan-fiction. (Smash speculation threads were the worst, just people saying "Goku?? Rayman???" over and over) Also, with this forum's obsession with Marvel movies and people making threads about completely random shower-thoughts about them or the 10000th argument about Thanos or whatever the fuck, I can just hit Ignore and not have to see them again.
I wish I could set filters to automatically ignore threads on certain keywords.
Also, I wish there was a way to hide threads without having to enter them, would be especially useful for leak threads where I don't want to get spoiled on the movie/game/show and I don't want to risk accidentally clicking on it.