If it fits your budget, you might want to consider getting a VIP guide at the Magic Kingdom. We did this last summer with two other families (7 adults with 5 kids between 2-11). It's expensive but splitting costs across the families helped justify the expense and we all agreed that it was worth it when they got us into the park before the gates officially opening, we stood in line no more than 10 mins for any ride, and were finished with all of the major attractions and then some by 2:30 pm without feeling rushed or tired. They were amazing, covered everything, and we didn't look at a map once!
This is the company we used:
http://www.michaelsvips.com/
Also to the PP who commented on the park being dirty and run down, we didn't experience that at all. I was also impressed by the healthy snacks they offered throughout the park (fresh fruit everywhere). Plus, Disney is constructing a totally updated Fantasyland, which was a nice change since the last time we visited. Several of the rides were operational when we visited last June so I would think it's further along by now.