I had the totally same experience with early online communities (Everything2, Slashdot), and for a long time made a conscious effort of keeping my avatar off the Internet. It's a little utopian, yes, but being able to deal with people based on their ideas, ideals, and quality of work, and develop fast friendships without ever being aware of so much (Great line: "How could the internet know you were gay? 80 years old?…
One thing I'm not quite sure what to make of is that I felt a lot of that aspect on the BBSs I started out on during high school, despite them being more local. Since there was free local calling but long-distance cost money (possibly a US-specific thing), I dialed up only local BBSs, which made for a certain location specificity. I liked that to some extent, because it made the local BBSs "special" in some way, kept…
Actually, while the forum had a very specific topic of focus, people there got to know each other rather more generally.
It's the one place where I wore an avatar. One of the cartoon character defaults.
The anonymity and strong community ethic of respect for privacy actually facilitated communication.
I find the "real name" initiatives ("now with photos") trending to the same sort of superficiality I run into "in real life".
"Brogramming" and a lot of the rest of the "current trends" also come to mind.
I think some of us are going to continue to look for those more intimate, even while more anonymous, communities. HN used to be (more than) a bit that way, before it exploded. (Where, too, people chose to reveal themselves to others, but on an opt-in basis.)