Seriously, I wouldn't worry about it too much. When DH and I did our first cruise, we were both childfree and REALLY of the opinion that kids might get out of hand. You shouldn't cruise DCL if you have a deep and abiding hatred of all kids, but seriously... bad behavior is generally the exception rather than the rule. We really only saw one or two instances of bad behavior on our previous 4 cruises (on the first one, kids running into the elevators and hitting all of the buttons before trying to jump off... until a guy grabbed one of them and made him ride the elevator the WHOLE way, up and down, every stop). The other one was kids running up and down the hall too late at night knocking on doors, and that ended with one phone call to guest services. Again, both of these happened only once on 4 cruises. Even adults who aren't big fans of kids (which we weren't, and we're mostly only a fan of OUR kid honestly) will be fine with a
Disney cruise. We've found that since they have so much to do and places to go with eachother, feral packs of roaming children is not generally an issue.