For breakfast, you can probably do better by going to Croissant Moon Bakery. They have very good muffins-my kids loved the french toast muffin (muffins are $3 I think). They also have a breakfast burrito (about $4) that is pretty good. They have a meal that about $6 bucks I think-muffin, fruit cup and breakfast drink. The fruit cups are big enough to share with 2 maybe 3 people and depending how old your kids are-1 muffin is big enough to share as well. But assuming the 2 adults get the meal and each kid gets a muffin or burrito-you are looking at about $40 instead of $80--if everyone got the meal deal it would be $42+tax (if your kids are small you would have left over fruit and muffins).
One morning you could even just go get pink big donuts--3 or 4 of them would feed 7 people--at $5 each-that is $20 plus drinks. And these are very good donuts.
One night we ate at the pool bar area and ordered the nachos with meat (which is enormous), and I think a kids hot dog meal and then we had the waiter get 2 appetizers from Jakes for us-the Wings and Calamari. I have 3 kids, so the 5 of us ate and were stuffed-and we had a ton of leftovers from that meal-could have easily fed 2 more younger kids. I think it was about $60 in total. And it was just a nice and relaxing sitting out there in the evening.
The one disappointing thing about the food at most of the restaurants at Universal is the kids meals. A bowl of pasta for $8 bucks is just ridiculous to me--and in most of the places the bowl of pasta was very very small. Same with the mac and cheese. We have 2 kids who order kids meals so it is such a waste when they both get mac and cheese--$16 bucks for about enough mac and cheese that costs about a buck--so at some places it is much better to get a big appetizer that the kids can share--like at Margaritaville-the nachos there are enormous also-it is a meal that can feed at least 2 kids (most likely it can feed 3 or 4 kids-depending on age and appetite)--and they get some protein vs the mac and cheese meals.
Another dinner option is to order pizza for delivery-Pizza Hut, Papa Johns, etc had some good deals locally, much cheaper than the pizza places in Universal-and for some people it is better pizza as well.
One thing that adds up in cost if you buy them all day are drinks. We actually had waters and Gatorade's because we drove and stopped at the store. But with 5 kids, getting 2 or 3 coke freestyle cups is probably a good value--first day is $12each, but to re-active them each day is $6 each--and you can fill the cup every 10 minutes. $18 bucks a day for 3 cups to share. If you buy a drink at each meal for each person you will spend about $60/day just on drinks with 7 people. And the freestyle machine's have lemonade and powerade also-so it does not have to be soda all day. And if you have your own cup-you can get cold water from the machines for free. And because we had the freestyle cups when we did sit down meals the kids got water in most cases-because they were getting enough sugar with the freestyle cups throughout the rest of the day! My kids loved mixing different flavors up.