A lot of DVCer cruise. When we rebooked on board they asked us if we were DVC and the booking agent said that every cruise has lots of DVC members on it - so it could have been coincidence. Then again, they do know who is a DVC member and who isn't.
(Florida just changed timeshare law to allow cruise ships to be sold as timeshares - I wonder who might have lobbied for such a law?)
In general Disney tries to schedule your rotation based on party makeup. People with smaller children start in AP, older kids in PC, and traveling alone or with older teens, Tritons. But it doesn't always work that way. We were seated with another couple and their children who were about the same ages - I suspect that wasn't chance.
Another thing to keep in mind regarding dining is that your DD may elect to eat with the clubs - particularly if fun things are happening over your dinner hour. Another thing you can do is ask your waitstaff to work her courses quicker, than take her to the clubs between entree and dinner. Dinner often lasts two hours - more than some little kids handle well.