The unit that got all the scare stories was Edmonton. A couple of my friends who came back had been posted there. I know NAV Canada has made a concerted effort to clean up that side of things.
YYZ is nothing like that...and I have heard good stories about YVR aswell. Maybe Jerricho can elaborate on YWG?
If you are coming over as an experienced controller you have nothing to worry about as you may have been in the game longer than some of your colleagues. They do respect that over here (in YYZ anyway).
However you are still starting as a trainee and it dosen't matter where you are in the world it still means that you have to accept that you "know less" than before and you aren't as senior as you may have been back home. If you want to put your head above the parapet and act like a and be a know it all then I'm sure the reaction would be the same at West Drayton as it would be in Canada.
Act like a professional and I have found they treat you like one here.