5. Adults are catered to as well. 

Disney doesn't focus squarely on families with kids; it includes parents who want to make sure they have some alone time during their cruise. There are adults-only restaurants on board, adults-only bars and lounges, and an adults-only pool. (Carnival, Norwegian, and Royal Caribbean all showcase adults-only sun decks, some with pools and others with hot tubs or just upgraded deck chairs.) Of course, Disney is the only large mass-market line not to have a casino, so if that's important to you, you'll want to look elsewhere. 

Disney also provides an adults-only beach on its private island that's one of the calmest, quietest stretches of sand on any of the cruise line's private islands. (Princess Cruises is the only other line with an adults-only area on its private island, Princess Cays.) Disney is the sole line to offer babysitting on its private island, and this may just be heaven for grown-ups as well as kids. Most islands owned by lines lack activities for kids that don't require parents to be involved, though Royal Caribbean does have supervised programs for kids on CocoCay and Labadee, and Princess Cays has a supervised playground.