The servers aim to please on DCL. The only time there would be any need for a discussion at the meal other than the first night or in Cabanas for breakfast and lunch would be if for some reason they had to make a change to the menu (not super common on DCL - it did happen a time or two on RCCL but options were pretty easily found).
The other time you would need to discuss at the meal is if you are doing a brunch or dinner at Palo or Remy.
If your cruise includes Castaway Cay, you will pre-order lunch and pick it up at Cookies One. My wife says that she would NOT recommend the GF/DF "cheese"burger there.