DW has no interest in planning (or even going for that matter). She has said “You know WDW better than anyone, I trust you”. Approaching the 180 day point for our last trip I asked her if there were any restaurants that she especially wanted to go back to or avoid. There was one in the latter category. As we’d been married over 20 years, we’re both “foodies”, and have generally similar tastes in food, it was pretty easy for me to pick our “slate”. She liked every choice I made.
For FPPs, she just tells me to make the ones I want and it will be good with her; if she doesn’t want to ride something, she’ll just sit it out (which she does for most coasters and other rides that might affect her back).
I made an elaborate itinerary booklet with day by day descriptions, meals, etc, menus from all of the restaurants at which we would be eating and maps of all the parks and resorts that we would be visiting. I think she read it once. But absent that, she’s the kind that would ask the night before "where are we going tomorrow, what time are we leaving the room, and do I need to wear “nicer” clothes (or will we be returning to the room before dinner).
When we go together it’s basically planning a solo trip that will have someone along with me. And we both understand that if she wants to sleep in one day, I go early and we met up for lunch. If she’s worn out, she goes back to the room and I follow when I’m ready. I guess I’m pretty lucky.