Depends on where you eat
But, yes - typically that is enough. We alotted an amount for counter service and table service and just stuck to our budget for those. Sometimes we went under (more often than over) and we ended up with a little surplus at the end, even.
For two adults, we figured about $20 for counter service (which is high) and $5 for a kid (again a higher estimate). So, $25 for counter (say, lunch).
Then, dinner buffets and table service can be eaten for no more than $30 per adult and $15 per kiddo (and that's REALLY high end estimates, in my experience). So, $75 per table service meal plus tip. That works out to about $100 per day for two meals, plus whatever you get in snacks, sodas, dole whip

, turkey legs, etc. Or light-up souvenirs for the nighttime parade, etc.