I should add, if you have two vegetarians in your group, then menu places will cost you far less than the buffets! Also- NEW for 2018 - some alcohol is now included in the DDP. That was never the case before, and that makes a big difference!
Another option you might consider - given your group, is the club level, if you are already planning to stay at a deluxe resort. Club level adds about $150 per night to the cost of the room. For that $150, you get a continental breakfast (7-10am), beer, wine, light snacks mid-day, desserts (8-10pm), appetizers (5-7pm), and all the non-alcoholic beverages you want (coffee, soft drinks).
There's no bacon/pancakes or eggs to order (though most now offer hard boiled eggs), and the appetizers are variable.
To eat, you have to go to you the lounge at your hotel. In short, if is great for breakfast and folks who go back to the resort before 10pm for some kind of break.
The great thing about the lounge though is that they offer lots of fresh produce and foods that are great for vegetarians! Breakfast has lots of fruit, yogurt, breads, cereal, oatmeal. The appetizer hour always has veggie trays, cheese, dips like hummus, and often salads (depending on which resort you choose). Many offer peanut butter and/or trail mix part of the day.
Desserts are cookies, tarts, etc. Things in small portions. There's also pretty much always a basket of apples/oranges out.