My wife and I have sailed DCL 3 times - twice just the two of us, and the most recent with our then 1-year old. We've never sailed with another line, and have no immediately plans to.
We're not big into characters, and they're definitely not in your face on the ships. They're very accessible, just not the focus.
The food is great, the entertainment is great, and there's ALWAYS something to do....for everyone. Kids clubs, teen clubs, adult clubs. Games. Pools. Recreation. Walking/Jogging track, which doubles as a VERY relaxing promenade deck, where you can park your butt on a lounge chair and watch the world go by (we use it for the latter, not the former, lol).
We're not drinkers or partiers, so we don't visit the night clubs, but we hear wonderful things about them from adults. And Disney also gets rave reviews from teens for their teen clubs and teen-only areas.
Many people scoff at the price, and think a Disney cruise isn't for them.....until they take one. Then they're hooked.