I'd say about 80% of the drivers around here have AWD or 4WD cars. I can't imagine living in a snowy climate without it. Of course, it doesn't help you stop (I also have super duper snow tires), but I couldn't drive up my street without it, let alone my driveway.
I learned to drive in the snow when I was 37. Enough said. I hate driving to begin with, so this was not a piece of cake for me. Obviously, most people don't need AWD in DC or the south, but to me, it is a necessity.