[mistercow]

>When I asked these guys about it, they said they got past it after a while. They all say, yes, I have experienced Tetris Effect stuff, but at some point the brain seems to filter it out.

That corresponds with my experience with the Tetris Effect from other games. I used to play a ton of DDR, and initially experienced the same phenomenon (as I've mentioned in a past comment, I took the SAT the day after buying and playing it all night, resulting in the fascinating experience of seeing DDR arrows superimposed over an SAT scantron). I was pretty heavily addicted to the game for a long time, but eventually the phantom arrows simply went away.