I liked my steak at CR better than my steak at Le Cellier but I love the pasta at Le Cellier and desserts and oh the soup! LOL! Sorry I got off track..
I really enjoyed the NY strip at Coral Reef and the filets at Le Cellier and California Grill. I've also read many good reviews of the filet at Jiko. (I'll be trying that on my next trip!)
The best true Steakhouse experiance on property is at Shula's Steakhouse which is located inside of the Walt Disney World Dolphin. Now if you are looking for the best streakhouse on property that you can use the DDP at then it would be the Yachtsman Steakhouse located inside the Yacht Club Resort.
Another vote for the Yachtsman Steakhouse, but be warned if you are on the Dining Plan that it is two credits as it's a signature restaurant. Also be prepared for around $50 per person before tip.