I used to be a staunch supporter of the DDP, but with the app taken away, and the tip exluded now I honestly dont think it's worth it. Also since it is your first trip I would prob veto the DDP unless its free. You will be so sensory overloaded that it will be hard to pull yourself away from the WDW action. There are plenty of restaurants to choose from, and if you follow some easy tips you can almost always find something to get into unless you are trying for Le Cellier or Cindarella's table.