I like the idea of buddypress a lot, but I haven't seen a lot of user/site admin involvement.
As one who would rather keep my sites running lean, than loading up with unnecessary features, I have to ask: Is anyone seeing any benefit from BuddyPress on your sites or is it just a resource suck?
Specifically, do you see:
Increased engagement from site admins?
Users "friending" each other?
A benefit to seeing activity streams?