We have eaten at two of the four places you named. We had an early dinner (4:30pm) at The Plaza about 3 weeks ago. We really enjoyed it. Like a lot of the restaurants, we found there wasnt a huge selection to pick from. With that being said, the portions we did get were plentiful. I had a bowl of tomato basil soup with a grilled cheese sandwich/fries. Both were really good (they do not have an adult grilled cheese on the menu but if you ask they will make it. It is a double layered grilled cheese). My husband had a salad and a cheesesteak sandwich/fries which was huge. We had lunch the day before at Coral Reef, spent 3x the amount them we had spent at The Plaza, and the food portions were tiny and IMO not as good. I would go to The Plaza again without a second thought.
Back in December we had lunch at Chefs de France. It was really good. We had some type of crepes. The service was great…the waiter was very nice and personable. He and my 7 yr old had a funny conversation. My son liked the waiter’s accent and kept asking the waiter to say different names but in French. The desserts were as good, if not better, than the meal. Creme brulee and one of the other desserts that I cant remember the name of. My parents went to Chefs dr France for dinner 3 weeks ago and said it was one of the best meals they have ever had at Epcot. My dad had the short ribs, soup, and dessert and my mom had the salmon, soup, and dessert. They said they ate so much they were too full to fight the crowd to meet us at MK. They found seats at the concert stage, relaxed and watched Paul Revere and the Raiders instead.
I dont know of anyone personally that has been to The Wave. Chef Mickey’s is suppose to be fun and the food okay. I think you go there more for the character interaction then the quality of the food.
Have fun and enjoy wherever you end up! : )