I'm currently on the college program working at the BBB in Magic Kingdom, so if you have any questions about anything I'm more than happy to answer them for you. I know I wish I had gotten to talk to anyone who worked there about it before I started because it was much different than the picture I had in my mind... still magical though!
And here's what you need to know about which boutique you want to be in. If you like having some down time at work to walk with princesses around, maybe ride a carousel, stand outside and put pixie dust on guests... hope for Downtown. If you enjoy being constantly busy (no matter what time of year) and like to be in the middle of all the happenings at Disney World... hope for Magic Kingdom. If you are even the slightest bit lazy, you should not want Magic Kingdom, lol... because it'll kick your butt. We lost a lot of girls that way.
Just a few basic thoughts from someone who's living it right now! Let me know if you have any questions!