I definitely don't think it comes naturally... but your driving skills apply to all forms of driving, once you aquire them.

The real test is your first autocross... you may think your a good driver, but when a stock 84 crx dx runs circles around you and you finish dead last in your class, you see your skills for what they are. I've nearly killed myself (not using the term lightly) several times due to driving incompetence, and only now after 3 years of autocrossing, do I realize that it takes lots of time and dedication to really get it. But I'm a much safer driver for it, and better at riding motocycles too.