Audiosurf: you have to be there?

So if you haven't caught wind of Audiosurf, here's the skinny:
It's basically just a 3D music visualizer combined with some kind of Guitar Hero meets Tetris game. It seems to be getting a whole lot of hype. However, it's in beta for now, so we can only take the beta testers' word for it.

Personally, I don't see the big deal. Supposedly you feel like you're in the music, but all I see is the "road" bumping with the bass and a rough correlation of the blocks (and scenery) with the rest of the song. Also, I don't understand the goal of the game. If I were writing it, I would have made it so the game is easier if you know the song, so your movements have to be correlated with some dimension of the song. I guess you have to play it in order to understand.

Here are couple videos (apparently most of the beta testers are into techno, but I found 1 rock demo)