Less anxiety!
The biggest thing I've noticed is that I don't have the devistating anxiety that I used to have. As a matter of fact, since I've started riding, I've turned into quite a daredevil. I find myself wanting to try things now just for the thrill of it. A far cry from the girl who couldn't even go for a car ride without freaking out we we going to be in a horrible car accident!
I think once you've descended a mountain on a bike going nearly 50 mph wearing only shorts, shirt, and helmet (and, of course socks/shoes), you know you can do anything!
If you can read this, take a pull.