Disney is — first and foremost — an entertainment company, so this is where the ships shine. Throughout your cruise, the talented staff will put on several Broadway-quality productions (and I do mean Broadway quality) that should not be missed (the cruise director told me that the shows are staged in Toronto for two months before they ever hit the ship's stage). We saw three on our trip — "Twice Charmed" (a twist on Cinderella), "Villains" (a gathering of all the Disney villains in one comedic show), and "Disney Dreams" (a Peter Pan-led bedtime story made up of sequences from various Disney fairy tales). Each show was worth keeping my overtired kids up night after night!
Our best tip: With 977 seats, the Walt Disney Theatre is large, but there doesn't appear to be a bad seat in the house. Choose an aisle seat right off the center section, and you'll enjoy cast members running up and down the aisles throughout the productions.