Wow, you will have a great time. I grew up in the LA area and went to
Disneyland often growing up. My public school was on an experimental year-round program, and I have the best memories of going to DL at off-season times when it was basically empty. Walking on to Haunted Manson and Pirates, which at that time were the latest, high-tech rides, was amazing.
Your story is a little like mine in that, for some reason, I insisted to my late husband (not into Disney as much as me) that I finally HAD TO go to WDW the year I turned 40. He had been once as a kid once, I think. I had always wanted to go to WDW since I was a boy. Wow, I loved it and now own points at the Grand Floridian and Bay Lake Tower. Definitely a home away from home. I still get a thrill from being in the Contemporary with the monorail running through, as I thought that was the coolest thing when WDW opened, and I was five years old. WDW is just enormous, and I felt like I hadn’t mastered it until had been there four or five times.
I can’t offer any LGBT specific tips, though. I can offer a few general thoughts for a Disneyland veteran at WDW. First, WDW is so much bigger than DL that it is shocking. Buy a pair of really good walking shoes like Ecco. Magic Kingdom is so much bigger than Disneyland it is incredible; I’m used to criss-crossing DL but doing that at Magic Kingdom is a whole different matter. It’s just much bigger, and EPCOT is huge. The lagoon at EPCOT is apparently the same size as Disneyland.
Second, Animal Kingdom is really wonderful and unique. Take some time to hang out there. And Hollywood Studios has a lot of great offerings, including the new Galaxy’s Edge. EPCOT is a little disappointing to be honest so if you’re short on time, that would be my lowest priority.