... well: http://xenforo.com/community/threads/sort-functionality-for-whats-new.9603/ . So no, I also do not use that much anymore overhere at xenforo.com. I am only interested in a limited portion of the huge amounts of forums overhere, but using the What's New gives me an unsortable overview of everything... which makes it too hard (also the forumnames not having their own column does not help!) to easily see what threads should be of an interest for me . Causing me to hardly use this invaluable function anymore...
I use Mark Forums Read on very rare occasions: I think I used it like 4 or 5 times in years. I always take a look at these new posts to be aware of the forum's content at all time.
I use the What's New button only when I didn't visit for a long time when there's more recent stuff than what the Recent Activity section can display. Other than that, I use Recent Activity most of the time.
In Vbulletin 3 I used the Today's Posts button all the time rather than using the New Posts one.
I used to use mark all forums read on vB when i used Paul M's hack to show how many posts i had not read.. I dont do this anymore because that hack isnt available here and i cant easily see how many new posts show up per day, week, month, etc.. Whats New on vB seemed flawed or just different enough that i never used it but with XF i use Whats News almost exclusively. I do really miss the ability to click on a forum status icon to mark that particular forum as read though.