We try new ones but we always do Chef Mickey's - although we have also added California Grill to our must do's.
I have eaten everywhere except the Chinese restaurant in Epcot, the English place in Epcot (we have a Rose and Crown just round the corner from where I live), Hollywood and Vine, Concourse Steakhouse, Mama Melrose, Coral Reef, Narcoosees and Boma.
This time we will be doing Chef Mickey's and California Grill then choosing from the remainder, and we will also be trying out Narcoosees for the first time.
We don't eat everywhere on each trip. We just choose from where we like and where is getting the best reviews at the time, as restaurant quality tends to go up and down. And also plan it all round what we are going to be doing.