Anoesis, I'm inclined to think that you're experiencing something that's not all "Mac-related." It sounds like your screen is helping you see the flicker of your lighting. That's a classic description of how a scanned screen interacts with florescent lighting, and in some places even incandescent lights flicker enough to do that. I have my desktop display set to refresh at a 72Hz rate because I had some flicker issues with it.
It's hard to think that a bunch of MBPs could all show the same problem without being noticed by Quality Control at the factory, because they actually run all of them before they box them up. (They don't get run for long, which is why some problems don't surface until later, but they DO look at the display. That's standard for every laptop manufacturing line.)