Wow, I've heard this a lot, I always get that kind of response when people learn that I have a car.
I don't get it, so what if you don't have a car, it's not anything that's worth mentioning and certainly something to give yourself kudos about.
Anyway, having a car just opens up that world of everything that's not reachable by train. Yes, I'll even truck on down to central Tokyo in my car and pay for parking but usually get a voucher when I eat somewhere with a parking agreement or just simply pay the parking fee. It's nice to get into a warm car and drive home in the cold. (or, A/C when it's hot outside...)