I haven't found much time for forums in the last few years. But when I do have spare time, I really enjoy them. Having made some of my closest friends from forums and social sites, I think it's been time well spent on that basis alone. That, and I tend to otherwise spend my time on the internet stuck inside my bubble, reading things that I already agree with and not getting exposed to a whole lot of different viewpoints. Forums broaden the way I explore ideas while I'm "wasting time on the internet".