I definitely agree that it's important to understand just how you are so that you can work with it. When I served on an editorial board in college, we had to take the Meyers-Briggs test just so that we knew what kind of personalities we were working with. It was definitely an eye-opener, but it made us a solid team as well, knowing how to play off of each other.

For those curious, I'm a borderline INTJ/INFJ.