Thanks Sandie, you're not treading on my toes. I didn't know about this information so it will be very useful to me.
The boys were fantastic in EuroDisney because it wasn't crowded and they were 5 years younger. The problem may come in the buses going to and from the airport where they can't escape the noise and being close to so many strangers but ipods should help them drown out the noise. Another problem is the sound volume in cinemas and shows - of ten too much for my youngest but he takes industrial strength earplugs and that works for him.
You learn what works and what doesn't the hard way