I used to not like it, but nowadays, I like it because it adds to the difficulty on those fast songs that end abruptly. Takes more skill, I suppose, in a way.
Now I'm not an Audiosurf expert though in my personal opinion it doesn't really take skill at all.. It just requires you to run the song enough to memorize where you have to clear the board and stop collecting cars. It's not really a matter of skill it's more a matter of taking measures to compensate for a rather unnecessary mechanic.
Technically it isn't a clean finish is it? You don't get a clean match in the same scenario with Eraser or Pusher. The match timer ends when the song finishes and there'll be blocks still on the board.....