If that's your goal then I say it's worth doing. The park is small in comparison to WDW but it's still Disney. We found all the cast members to be very friendly and helpful, especially with the language. I remember the intros to the shows being in French and in English so the language barrier was minimal. I don't remember the shows themselves though or if it was a problem. I brushed up on some basic French from high school so it was enough for us to get by. Plus, if you're friendly to the cast members and let them know you don't speak French they will speak English to you. It was definitely fun to go there. I don't think there would be enough there to spend more than a one or two days....would definitely plan on visiting some other Paris sights. We went to Versailles, Normandy and spent the rest of the week in the city and did The Louves, Notre Dame, Sacred Heart Chapel, Arc d'Triumph, etc.
If you subscribe to Travelzoo.com watch for the Paris specials. When you find a package that is priced right, jump on it!