A lot of the spirit you mention and miss seems to be alive and well in the Clojure community. There's a lot of enthusiasm for old-fashioned hacking, improve/extend discussions, just fun times a lot of the time. I don't get that as much when interacting with, say, the JS community, or any other than I can think of. The Clojurescript community in particular is a really experimental bunch, with high energy (and many of their experiments have reached #1 here on HN in recent weeks).