I'll generally tell the clerk that I'll bag, which speeds up the lines, and I get stuff pretty much where I want it. (My store doesn't generally have a dedicated bagger)

I'm not sure if there's someone who will bag your groceries in all of Canada. I've always done that myself

I bring couple reusable bags, that are more like foldable boxes than a bag. It makes bagging trivial because you just set your stuff in a box. It's organizing groceries in small and fragile plastic bags that's the hard part.