No garage for my cars, I have a coverall for my work area and storing the tractor, OPE, and toys as they aren't as weather resistant.
I've heard about the heated garage issues with salt in the winter so I'm not in a rush to rust my cars faster.
Our paint never seems to go bad here and I wax rarely, and the interiors never get hot enough to damage them, but some black plastic gets lighter with time. The roof racks on the Focus are going grayer now, but its not an issue for me, unless they get brittle. Cars are really just tools for us, be it family hauling, autocross, commuting, etc., so the new car is actually annoying trying to keep it relatively perfect for a while.