We did 10 days last year, and we're hoping for 14 this year. It was a lot of food, but it was so relaxing to have everything paid off ahead of time. It was also very indulgent to be able to order whatever we wanted, and to always get dessert. Usually, I plan on having dessert but end up skipping it because I'm too full/cheap.
I did get a little tired of having an ADR for dinner every single night, but I'll resolve that next time around by booking a few lunches. A breakfast or two would also help, but I can't quite bring myself to use a credit at breakfast yet. I thought my dh got sick of all the ADR's, too, but he's insisting that I make an ADR for every night, as well as a few lunches, just to cover all our bases.
I personally would find it a little difficult to go from a week on the DDP to a week of no DDP. Kinda like staying at a 4 star hotel, then moving down to a 2 star. If I were to do one on/one off, I'd probably schedule the "off" week first, and plan on commando-ing the parks during that first week, then kicking back and relaxing more the second week. I realize that messes you up ticket-wise, but there just isn't a perfect solution.