Another vote for the filet at Les Chefs, but I see no park hopper for the day.
We didn't try Le Cellier, actually cancelled an ADR there. The idea of mushrooms smothering a perfectly good steak makes me sad. We grill/smoke 4/7 days a week and I am a BBQ judge a dozen weekends a year. I, um, have some strong opinions on the subject. We don't go to Disney often so trying everything is sadly not possible. It is great there are so many options from which to choose.