I did a morning of touring MK alone, when DH wasn't feeling well and decided to stay at the room (it was our second trip there in a little over a year, so he wasn't missing any first time experiences), and I loved it. I was there at RD, and could have ridden almost anything standby with no wait, but instead I lined up to meet characters (which DH does not like but does to humor me), ate a churro, people watched, and headed back to the resort at about 1:00.
Would your husband be interested in coming to Orlando with you, but relaxing at the resort while you do the parks solo? Maybe he'd sped SOME time at the park?