Have you met any first or second generation Canadians? Yes, people bring their culture and their traditions. And by the time you get 1 or 2 generations down, aside from a few different holidays Canada's school system has done a fairly good job of normalizing the population.

Immigration is a major source of Canadian talent and innovation... A lot of the systemic issues around larger populations aren't related to immigration, as others noted, but to short sighted, "get me elected" policies for our political "leaders".