It is the most elegant experience you can have in all of Disney World, outside of Victoria and Albert's. A truly great dining experience, for those who have the TIME, to sit back and relax and savor the true French dining experience. They take their time here, so it is not a reservation to make to squeeze between other activities. Expect to spend a minim of an hour and half here, easily, and most likely it will be a 2 hour+ experience.
This is the type of dinner to end your evening on, and then retire back to your resort. I have seen some irate guests frustrated with their evening's pace as they wanted to make Illuminations. Alas, if only they had known! This is as far removed from "Disney" and "Themepark" stuff as you can get, for adults who want a quiet evening with class and sophistication but don't want to shell out hundreds of bucks at V&As.
And of course, one has to have some appreciation for French cuisine, I would think, as there are items like frog's legs, and escargot along with some other interesting concoctions, on the menu. This is a small restaurant, meant for an intimate sort of experience. The wait-staff attends to you very closely and respectfully.
As for the food, it is divine. I have been here when it was called Bistro de Paris, and while there have been some changes in the transition, both establishments essentially have strived for the same sort of dining experience. Perhaps one is superior to the other, but I found both to deliver top noth experiences that stand out from the rest.
My most recent dining experience was last May, where I had dishes such as the frog's legs and I had the bass fish with the potatoes scales put on it, and then the chocolate sphere for dessert which they make special for you and it stunning. All dishes were superb. I always get wine as well and that I enjoyed very much as well.
ETA: I should add that when I was considering all the Disney restaurants, I was only counting the obvious ones such as are on the dining plan. Of those, it is the most elegant, and certainly the most elegant experience in the theme parks, by far. I forgot about the other eateries not on the dining plan which can offer a similar dining experience. I'm always on the dining plan, so I never patronize those other establishments like the aforementioned Ill Mulino.