It used to be that cars didn't have air conditioning, and, even after they did, it was a long time before I personally had a car that had air conditioning. As anyone will tell you, once you have a car with a/c, you can't go back to doing without.
I'm here to tell you that the same goes for heated seats, if you live in a place like Minnesota. My current GTI is the first car I've had with heated seats, and, as long as I live here, I can never again have a car without them. It's become a necessary, almost-decadent luxury.