I am not one, but I know someone that was attached to a rather large group of players that even had parties happening in SL an the real life, connected via webcam. They definitely used it to the max.
EDIT: Just normal parties with people sitting around and chatting :).
Reading lsc's comment about the type of things SecondLife is/can be used for and then your comment about webcam parties makes for a combo which is hard to talk about in public.
EDIT: Just normal parties with people sitting around and chatting :).