I just signed up for a summer class. It think it is really important that educators (teachers, et. al) have the opportunity to be a student as often as possible. The shift in perspective (from teacher to student) allows you to reflect about someone else's teaching (the good and the not so good), as well as get the opportunity to (possibly) struggle as a learner. Take note of the strategies that you use to overcome any learning difficulties and share these with your students and colleagues when you get a chance. Remember, the class you take does not have to be professional development, take a photography class, learn a language, whatever. Just remember to reflect.