Just out of curiosity, when you used the gastric surgery card did you:
1) get half portions at full price?
2) get to order off of the children's menu?
3) get reduced pricing at buffets (e.g., being charged the child price)?
I ask because most folks (regardless of age) are allowed to order from the children's menu at TS restaurants. I haven't read of anyone getting half portions of adult meals at half price or of getting discounts at buffets recently. So I'm just curious which options you were given.
(Regarding the OP's situation, discount pricing probably won't be much of an issue/help because they're on the DDP.)