Hubby and I have shared the Tonga Toast and the Big Kahuna before--no problems. We go for a later breakfast seating and then can skip lunch. It is a large amount of food. We find the Tonga Toast to be so sweet that it would get sickening to try and eat an entire order alone. If you want a lighter breakfast you could order the Big K and share--it depends on how much you like to eat. We love breakfast and tend to "pig out" here.
My DS-13 and I shared it with a fruit bowl and large choc. milk. We had plenty and didn't feel too stuffed. We both thought the scrambled eggs were too runny. Otherwise a very nice breakfast in very nice surroundings.
My husband and I shared the Big Kahuna breakfast, I ate the pancakes and bacon and he ate the rest, I ordered a half of a grapefruit as well. It was plenty of food for 2.