Our two daughters and their families are going on one this coming spring and wanted all the grandparents to go along. My husband and I opted out because I don't want to spend that much money to be surrounded by a bunch of tired, over-stimulated children and their tired parents.
A friend of mine who is actually a professional clown has been on a couple of these cruises as a working performer and she said she'd never do another for the above reason.
I've done a Disney cruise before and really enjoyed it. One option you might want to consider is splitting your vacation time between the Disney theme parks and a 3- or 4-night Disney cruise. Disney has packages that make it easy to do that. Have you spent much time at the Disney theme parks before?
My husband and I took our kids to Disney World about 3 years ago. We visited all 4 major parks and 1 of the water parks. We would love to take a Disney cruise but we have 7 kids so the prices seem so out of reach for us. We recently started paying on a "regular" cruise for our family that we will take in June.
Disney cruises are such fun! For those who want to combine Disney with a cruise, remember that there are lots of ways to do so. In addition to sailing on a Disney Cruise Line ship, one can always combine a multi-day visit to the Disney Parks with a cruise experience on other lines sailing from Port Canaveral or Tampa. Many cruises from other East Coast ports also include Port Canaveral on their itineraries, so it's possible to take a shore excursion to Walt Disney World on your day there.