Let me start of by saying that there are some aspects of Le Cellier that are not enjoyed by all. First, tables are very close to each and some folks don't like feeling like they are sitting with strangers. Second, it is a little dark in there. So if you like bright, cheery places, then this may not be for you.
Now that I got that little caveat off my chest, I will say that this is by far my favorite WDW dining experience. The staff was very pleasant and helpful. The filet is absolutely top-notch. The cheddar cheese soup is the best soup that I have ever had. The breadsticks are phenomenal. The tomato stack is one of the more unusual appetizers that I have ever had, but it was very good. And the maple creme brulee...don't even get me started on how good that is. If you couldn't tell, what most people think makes this place so great is the incredible FOOD.
It is a little pricey, but if your budget can afford it, everyone should at least try Le Cellier once...jmho