It didn't really help, to be honest. I only remember one or two users who actually helped me with the way they dealt with social anxiety and managed to change one's way of thinking.
I've always seen SPW as a place where people would vent more than provide advice. The way I see it, when someone gets better, 90% of the times you just leave the website and don't come back. Often times, it's too stressful to come here, too 'heavy'. A lot of the stories are sad and really make you feel anxious yourself at times (sometimes there are even stories where people describe how they feel and you go 'whoa, never thought about that' and get even more paranoid in social situations).
Don't get me wrong, I agree that places like SPW are definitely necessary (as some people have no one else to talk to), but it's often quite a downer, which is one of the reasons I rarely visit.