/b/ is....kind of annoying imo, but I regularly lurk on /vr/, /ck/, /co/, /tv/, /adv/, and /u/. Mostly /vr/ and /u/ because a. I'm a retro gamer and b. Even I'm not immune to being a bit lewd...
I haven't been on 4chan in quite a long time. I was a regular on /b/, but if I ever went back, I'd stick to /x/.