There is a good chance that the more 'boring corporate' people tend to keep to themselves more. I don't imagine serious startups are always glaring things in your face about the technologies they use, which comes off as 'web startup land' to people who are willing to read that kind of stuff. (not that I'm any different)

I bet there's a whole other demographic of serious business people who are busy getting things done instead of discussing unrelated matters, or in other words, doing things that aren't work-related.

There is. For example, all tier 1 investment banks use Java for their trading infrastructure (as well as C++).

There's a website out there called InfoQ, I think that's where all the enterprise folk hide