We went march 5-9 and when we came back I wanted to write this exact post! We too are WDW veterans and this trip was just a little bit "different".
I knew about the fast passes being limited to one park- we are not planners at all and made the fast passes right before we left the hotel each morning and sometimes we made them from our phones right in the park. They were never really an issue, but it would have been nice to get different attractions in different parks.
For me it was small things that add the "but" to "I had a good time". We had reservations for 9pm at be our guest, we're seated at 9:45 pm and I had salmon with saffron and leek mashed potatoes. I have no idea who would think of putting saffron and leeks in mashed potatoes, but they did and they were awful. Just keep it simple. I agree that the menu is too much for Disney.
The thing that did it for me, and talk about small, is the RFID tags on the bottom of soda cups- the paper soda cups. My husband ordered a soda and I just wanted water, so she gave us two cups. He got soda, I got water. Now, ethical or not, I just wanted a tiny sip of sprite so I went to get some and my cup wouldn't work because it was coded only for water. Then my husband have me his cup (they give you three refills) but it told me I had to wait 23 seconds for a refill- I'm guessing they figured out the average time it takes to finish a soda and put timeframes on refills? It just freaked me out, like I've always known they watch you, but this is a little too big brother.