You can go to the Disney parks in North America any time. I assume that based on your posts this is rather a 'once in a lifetime' trip.
You are going to FRANCE, to PARIS, and spending 5 days at Disney really is a great shame, even for a Disney fan. You are not going to Epcot, you are getting out into the real world where there is really a lot more to see and do.
Regarding your cruises, you are talking about two completely different parts of the world. Choosing based on hot vs warm isn't the best criteria. Don't you and your wife have specific interests (besides Disney), places you have a desire to see, etc?
If you plan to stay on the ship for most of the cruise, you are wasting your money by not seeing the ports. Cruises in European ports are not like the ones sailing in the southern parts of the United States; they are more like transportation between some of the major points of interest in the world than a floating hotel with the major point being relaxation and eating and using the spa.