This is a funny thread. Instructors have names for all of those cliques and it's been the same at every gym i have belonged to or worked at. The only group that intimidates me now is the Pilates clique. At my gym, it's a good mix between outdoor cyclists and people who just do spin. If you go at night or early AM, you avoid the talky non-roadies. Most are nice, but we have our names for a few.
I ran on the treadmill today. I don't know how you guys do it. I want to seriously improve, but I can barely manage 9 minutes at 6mph. I did a total of 26 minutes, though, at a very slow speed... I hate feeling unfit.