We've had consistently good steaks at Le Cellier. Specifically, I really enjoy the Le Cellier Mushroom Filet Mignon as I have ordered it every time thus far.
We haven't tried Yachtsman for ourselves, but have heard many good reviews about this place.
We have tried a few Shula's locations, but not the one in WDW. I don't see the point of going there if you have a Shula's closer to home.