We have done the Deluxe
DDP for the past 4 years for a few reasons:
1. We've always gone during
free dining promotions and the cost to upgrade was minimal.
2. We are always traveling as a large party and it saved us more than doing the room discount.
3.
The convenience of being able to pay over time and then arrive and have to deal only with gratuity was a lifesaver. No waiting for mom to hem and haw and try to order the cheapest thing on the menu or trying to split the bill and figure out which jerk ordered the steak and who only had a dinner roll. 
4. I love a great meal and I LOOOOOVE Disney restaurants!
5. I am a planner, a list maker (can you tell?) and a rather meticulous person by nature. Having reservations made and meals taken care of ahead of time was huge (and you pretty much
have to in order to use all those credits to your advantage!). Never once did we have to suffer through ten people saying "I don't care, what do
you feel like?" as we're starving and it's 300 degrees. Reservations are set. Show up and shut up.
LOL I love this!!!