It's a personal thing. If you like group activities with an organization and bylaws and rules HOG is a good thing. If you are a lone wolf and do not like that sort of stuff don't bother.
I joined at first to see what it's about. The local HOG chapter I belong to has rides scheduled almost every weekend. Cool thing about that is you just get in line, make sure you don't run into the guy in front of you and just ride. It's a ton of fun especially if you're new to riding. The folks are all nice and willing to share their experience. You get to see a lot of different bikes. We also have a really safe group so that helps. I've been to some really cool spots on many different routes that I probably wouldn't have tried by myself. Then when we get to the appointed spot, we have a great lunch at a restaurant. I like it so far.