Interface revamps always take time to adjust because of habits.
I, to this day, am not a fan of the sidebar (I feel that it adds a layer of complexity), but I know that my current opinion isn’t mature enough to be considered a definitive opinion by myself.
I add that I have different habits on different forums or forum software.
For example, I never use “unread” on Discourse, because I didn’t bother thinking about it. It never crossed my mind.
But now that I think about that (like, at this very moment), I also use daily a vBulletin forum I always open via the “new posts” URL. Go figure! 
I’m sure that I’m not the only one who sticks to habits kind of randomly, and that impacts our feelings on changes that we could find beneficial if we dared to adapt a bit.