I also taught for Kaplan for about a year and a half- did some SAT stuff until my MCAT scores and then changed to teach for that. It's a lot better now- they pay you for the amount of "study" time you put into prepping for the lessons. When I started, all you got paid for was the time you were in class, which was a decent pay, but didn't pay off considering you had to know your information inside and out. But the great thing is that if you teach a number of different classes for the same test, you have to do SO much less prep work.
For the most part I loved teaching-- I often spoke with the students after class and talked with them about my experiences applying to medical school and interviewing. Some students are jerks-- trying to show that they have stupid details memorized and inferring that because I didn't know them, I am stupid, but that's just typical of teaching.
One great thing-- TUTOR! As long as you are friendly and knowledgable, you will get a good evaluation from the student- which means BONUS! ;-)
Plus, you get to meet pre-meds from your school if it's huge, other schools, or other teachers which is always fun!
Enjoy!
PS: Bonus is that if you work for Kaplan for two years, you get ANY course for FREE- yes, that means that the USMLE prep course costs NOTHING!!!!! (saves you thousands!)