I've never gone with an actual list, but usually I have ideas on how to improve from last trip.
For example, a few trips ago, I realized that I could take pictures of the fastpasses we collect (as you surrender them to use them) for our scrapbook. The next trip, I realized the backgrounds I had chosen (pavement) were boring, so I started shooting the cards in front of the respective attractions.
For our upcoming Christmas trip, I want to recreate a picture I saw on the Disney Parks Blog. They were advertising those mini-mouse ears (not sure what the point of mouse ears that don't fit on your head is...but I'm sure some don't see the point of mouse ears that do fit on your head!) and they had a picture where the photographer used forced perspective to make it look like Spaceship Earth was wearing the ears. I'd like to try to recreate the shot with normal sized mouse ears (or potentially my Santa Mickey hat--which may be a challenge as it is not as rigid as normal ears).
I'm also excited to be able to shoot New Fantasyland for the first time, so some shots there and in Storybook Circus will be on my shot list.
I also love pictures of my family enjoying rides when possible (for example, a picture of someone taking a cell picture on Kilimanjaro Safaris, a picture of our family on a coaster [Splash, BTMRR, and Expedition Everest work well for this] going down a hill [a real challenge because I usually don't want to miss the coaster!], or pictures with the family and the ride on the slower boat rides (I've gotten decent pictures on Small World, Living with the Land, and Jungle Cruise).
I always have a couple of standard goals--full group pictures in front of all four park icons during the day and (if possible) at night; "kids" picture on a certain bench at the Boardwalk (we've taken one there every year); use the latest piece of equipment to get newly-possible shots (for the upcoming trip it will be the 50mm/f1.8, which I hope to use as a walk-around lens on a "light" day); take at least one picture to remind me of every ride, show, and meal we experienced (this never works; I always forget to take a picture of at least *some* attraction signs before no-photography rides, or I dig into a meal before I get a chance to take a picture--although I don't think I've missed a character picture yet...).
I did make a cheater card (index card "laminated" with clear packing tape) with some notes on settings for things like dark rides, night parades, and fireworks, and I usually also make another index card with lists of local sunrise and sunset times for my trip.