It's barely noticeable except when I come back from abroad and expect train doors to open on the wrong side, it happens maybe a couple of times until I get used to it again.
For trains the door side is hardly ever standard, even if the train always uses a certain track out of 2 directional ones. Some stations have center platforms, others have side platforms. Maybe there is some network in the world with only one type, but in most cases they come in a mix.