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I think one very important tip is to not order everything you are entitled to just because you can. For example, if everyone is stuffed silly, don`t order everyone a dessert just because you are entitled to one. Some people think that this would be wasting money, but don`t forget, you would be paying tip on all the extra food that you didn`t want anyway. I think its easier to think of the deluxe plan as an all-inclusive plan.
And if you have extra credits left over at the end of your trip, have them converted to snack credits and stock up on snacks for the lunchbox or, better yet, with snack souvenirs (Disney-related candy from Goofy`s or Mickey rice crispies, etc.) for friends back home!