I've been using OS X for about a year, and, after briefly trying admin login, have always logged in as root. I've had no, repeat, NO problems because of it. It makes a lot of things much easier, too. I never have to open up the terminal and type in stuff to extend my privileges, for instance. I just have them, like I did with OS 9.
I think the fears are unfounded. I haven't found anyone who'll say what problems they've had as a result of root login; they just repeat the claim that it's "risky". In my experience, it's not.