have had great steaks at Kona Cafe/Polynesian, Grand Floridian Cafe/GFlor, Maya Grill/Coronado Springs, The Wave/Contemporary, Turf Club/Saratoga Springs Resort, Captain's Grill/Yacht Club, Olivia's/Old Key West, Le Cellier/Canada Epcot, San Angel Inn/Mexico Epcot...in other words, most places we've eaten at Disney that had steaks on the menu did a good job with them. And we're from cow-land (Omaha Steaks is only 40 minutes away from home, lol.)
Actually, the only place I can think of we didn't like the steak, was Kouzzina...was so salty, I had to scrape it off.