I have always loved the DP, and have used it on 2 stays while at POR, and CSR. We always took snacks and waters with us, had way too much food for us, so we would order 3 QS for 4 people. It spread our meals out and worked well for the kids since they would rather eat off adult menus vs crappy hamburgers, etc.
We were there last in Dec 2012, I kept every single receipt to compare to what we spent on the plan. It turned out we paid $810 for DP for Me, DH, DD9, DD 10 (adult age/price/meals). We actually spent $ 1065 in receipts. Including 20%+ For a savings of $245 or 23%. Now, we ate steaks and snacks with high prices to get the most "bang for our buck". But... We ate things we wouldn't normally eat, such as $7 desserts, or $6 smoothies.
This June, we are going, and staying at BLT for our first
DVC trip since purchasing during the above stay, and I'm budgeting $600 to include alcohol in parks, a QS everyday, ADRs at Olivia's Cafe, and 50s PT cafe, with other meals at room in the kitchen. I'm on a strict diet and this will help as last time, I gained 8 pounds...
So it's a personal preference for DP. It could depend on each trip you make. Our next trip will be a studio with a DP, as we will have a short 3 day stay.
Good Luck, have fun!