More cautious drivers are going to be more intimidated about this than most people, so they're more likely to move move over a lane so that they don't have to deal with it. They also, of course, tend to be slower drivers.
I've no experience driving in Europe (Europe, I love you), but I suspect that a big part of why I don't see this sort of thing happening in Canada is that, outside of very dense places like the middle of Toronto or Montréal, the onramps tend to give you a good kilometer to merge. Sure, you might also be liable to get a ticket for loitering in the left or center lanes, but that's also illegal in the USA. It's just not enforced, because everyone does it, because the roads encourage you to do so.