I used to do the same thing, until I realized that its not that special to see them anymore since I see about 5 a day in NYC lol. Now I just get mad that they are not mine, especially when I see someone my age driving one (God damn rich kids lol).
I'd hate to drive an exotic car in a crowded city street. I don't see the fun in it. If I was wealthy enough to own one, I would use a private car service. Or at least be chauffered in my exotic car (granted it's an appropriate one)