Hi seasider. DLP can be very expensive for food. Rainforest cafe for us is always more than €28. The half board plus won't actually cover inventions or auberge de cendrillon. Just take €28 off the €45+ it costs. The half board plus will cover Annette's diner though. Really the choice is between having a meal (at table, order from waiter etc) or counter service. If you feel just a burger and chips like McDonald's will suit you (an expensive mcds) then don't use half board.
What I'm trying to say is the half board (dependant on the hotel) is more intended for; plaza gardens, hotel buffets, Annette's diner etc. So have a look at those and see if you like the look of them. If you do then half board might be worth the money.
Hope that helps. And enjoy your trip 😊