In addition to Golden Corral, we have had an excellent buffet breakfast at Ponderosa on the 192 (near the giant orange). It was $9.95 a person, plus a beverage. We got a coupon for a free breakfast buffet by signing up for their email club, so it might be worth doing so right before your trip to help save a few dollars.
Sweet Tomatoes near Universal offers a weekend breakfast buffet that's very fresh and tasty. Its $8, $9 or $10 a person depending on which option you choose (the $8 is the unlimited buffet, $9 is the buffet plus a drink, and $10 is the buffet, drink, a made to order omelet and either two links of sausage or two strips of bacon). But....it is Saturday and Sunday only.
IHOP is also awesome, but its plated versus a buffet. Prices are very reasonable and portions are huge!