You have missed a lot. The Bodybuilding forum is now basically for actual competitive bodybuilders, and there just aren't a ton of competitors here (yet, or for now, or whatever). Bigger, Stronger, Leaner is the primary lifting forum and that's plenty active. Powerlifting, Over-35, and Beginners, are also trucking along at a steady pace. Off-Topic and PWI are popular as ever. Thibaudeau and Wendler's forum are busy.
Basically, the forum's are just fine, you're just out of touch with the changes. (But welcome back. Those T-Park videos are truly classic.)
Looks like you had a half-dozen posts in 2012, one post in 2013, and now this thread. I'm gonna guess there are some people for whom participating in an online discussion forum has taken a similarly low priority in their lives for various reasons.