that's just the thing though - they're not. they're specifically designed not to be. each plate is pretty much a big British countryside, only in space and without people from Yorkshire.
the only real difference between living in one of those and living on Earth is that if you looked up in the sky in one of those you'd see two other big world-slices, which would be kind of unsettling but eventually you'd get used to it. it wouldn't even be a "getting used to" thing, really, since the people living there would be bigwig scientists and physicists and ultra-smart best-of-the-best people and they'd have kids and their children would grow up never actually thinking it's particularly weird.
ed also i think there's bridges over those big windows so you can move between the world-plates, which would probably drive acrophobes completely insane.