How much of a Disney veteran are you? If you haven't been to Disney before or you've been once or twice I'd say skip it. There is a lot for you to see and do in each park. If you're Disney veterans then by all means. We've been to Disney a few dozen times, so I will pass on certain things. I don't care for the Tiki Room, Pooh and Grand Prix at the Magic Kingdom for example. At Animal Kingdom as long as I do Expedition Everest and Kilimanjaroo Safari, I'm good. If I can throw in Dinosaur and Khali it's summer, then it's gravy. I can head over to MGM and ride Rocking Rollercoaster, Tower of Terror and Star Tours and Toy Story Mania I'm good. I can typically combine both of those in one day. If we arrived late to MGM we might have had to sacrifice Toy Story, but since we know we'll be back in a few months it's not a deal breaker for us. During slower times we can even combine MK and Epcot because we'll get fast passes for Soarin' in the evening and walk World Showcase which tends to be open later than Future World.
One piece of advice I would give you is not to get up around 9ish. Get up earlier and be at the parks for rope drop which is typically 9am. You'll get much more done as the park is still pretty empty. It is especially helpful at Magic Kingdom. If you want to be ambitious and get the most of this trip, you'll need to get there earlier.