I do as well. I rarely pay attention to the handles on the site. There's probably less than a dozen I can remember on sight. The reason I do remember the names I recognize is because they used to consistently and always be at the top of the discussion.
Still, the comments I do up vote end being from the rock stars you are referring to.
I'm certainly not saying the folks on http://news.ycombinator.com/leaders don't deserve to be there. By and large, I think most of the folks there provide tremendous value to this community (even the ones I vigourously disagree with on a routine basis).
But I've also noticed that it seems since pg turned off the points, the names I see at the top of a discussion are more and more ones I don't recognize, and more and more ones that aren't on the leaderboard (and even if the leaderboard members aren't the topmost comment, they usually show up near the top because they provide good comments).
I like the new frothiness of HN.
Except this, I agree with most of your comment. Most of the time I just up vote a good comment with out my eyes sliding to the poster's name (it provides me no meaningful information in most scenarios). Still, the comments I do up vote end being from the rock stars you are referring to. It's possible that they are able to put their thoughts into comments better than others. Since most of the names don't trigger a face to most people I don't see how this could be due to bias.