What's the point of raking the snow off? Fear of cave in? Water damage/leak? Maybe I don't like my house as much as you guys, if either of those things happened it would suck, yes, but then homeowners insurance upgrades.
In my old neighborhood, our neighbor's garage collapsed on top of 2 cars. Yeah, homeowners' covered it, but what a PITA. And I would never in a million years be able to replace (or even remember) everything that is in my garage.