I do not flinch from riding in traffic, and I sometimes enjoy it, but I don't particularly do it for the rush. In fact, if I get a rush from anything other than some good downhill speed or traffic flow, that's probably a bad thing. I'll see if I can dig out one of my downtown LA videos from when I commuted for a couple of years.
Edit: It took me forever to figure out "cagers" around here. The term does sometimes cross my mind when I'm riding in traffic, I'll admit. At least now I know where it comes from.