We use Karen at MJ-she is terrific. It always seems like I'm emailing at 7:30 on a Sunday evening with a question, and she always gets back to us quickly.
I am a planner from w-a-a-y back, but it is reassuring that she'll look for additional discounts that apply to our vacation parameters and knows the ins-and-outs of the Disney vacation package rules.
This allows me to spend my time planning---figuring out where we'll be eating and EMH days, which shows we want to see, and other Disney details!