I just got back from Paris 2 weeks ago and we went out to DLP Sunday afternoon and caught the train to the airport Tuesday morning. If we did it again we'd just do a day trip via the RER train and wouldn't spend any nights out there. We opted to stay off property, at the Radisson Blu, just a 7-8 minute bus ride away, considering the cost of staying on property I would not recommend it, just find a close place that has constant shuttle service, the Radisson departs the park every 30 minutes so we were never waiting.
As others have said the magic kingdom park itself is beautiful, easily the most visually stunning that I've been too. They were doing construction on main street, and a lot of the restaurants were closed and had signs telling you other restaurants to go to, only when you get to them you find they're closed so your options are rather limited if you want a sit down dining experience like we did. They do have fast pass on some of the rides, but we never utilized it as wait times were quite low, usually 10-15 minutes at most, often just 5 minutes, though we went off peak so I'm not sure what the times are like when the park is busier.
Disney Studios was a huge disappointment, the only reason I'd go back would be to see Ratatouille. It really needs 3-4 more decent rides to help spread out the crowds and give people something to do. We went on the rides, explored around, and switched parks after just 2 hours.
