I go to SMART Recovery meetings. It's not group therapy, but it's a program for learning tools to cope and abstain from your addiction. It's based on cognitive behavioral therapy though, and crosstalk is encouraged, so it often ends up kind if being like group therapy.

I really like it. It's helped me immensely with my sobriety, and it's also given me CBT tools to use in other aspects of my life. Plus having face to face contact with people who know you and like you and are in this together with you can be really helpful. It gives me a social network outside of work and gets me to actually socialize.

I think if I didn't have SMART or wasn't struggling with an addiction I'd go to a depression support group to try to get the same thing.