Every job you have is going to teach you a little bit more about yourself — about how you like to work and what you want out of a job. You discover more about your preferences, like how you can best keep yourself organized, the types of coworkers you dislike and your strategies for dealing with them, and whether you prefer communicating by email, instant message or by phone with the person in the next cubicle (personally, I don't understand the urge to pick up the phone and call someone sitting six feet from you).

Knowing these things about yourself will likely help you navigate the work environment, help you figure out how to either adapt to systems or introduce "your way" of doing things to make improvements for everyone.

Side note: I wonder, how much do your first "real" job experiences affect those preferences? Is one inclined to think the "right" way to do something is the first way s/he learned how?