My husband is not Disney crazy like I am but for some reason, off to Disney we often go. I should ask him for you, why and when he made the decision that it was okay.
I know that buying our DVC membership helped a lot. His happiness purchasing it was the ability to trade your points with RCI and go to different places. But we have only done that once (to Kauai,Hawaii; great trip). The rest of the time we have used our points with Disney. The better quality resorts and amenities I think also really helped him want to do the Disney thing especially when he realized that the resorts were a destination in themselves. I do think going on a
Disney cruise reestablished or began an even higher interest for him. He got the best of both worlds; Disney and off shore non Disney port excursions.
At some point, probably when our boys were 5 and 8, I think he also realized that Disney vacations were the best for the family because they always worked. It wasn't an effort to have fun. We were not worried about the kids being in the right place. If it was a given that we were going to spend money on a vacation, we might want to guarantee that it would be a success.
But definitely there has been a transition. Early pictures of our Disney vacations show that my darling husband nose deep in his cell phone (way before they actually became interesting) and now he is fully with us and smiling.
So, good luck. Hopefully, your husband will get some pixie dust sprinkled on him and it will all work out.