I hear you, and I don't know your husband, but I know 50+ of my experience. Often enough, the unexpected happens both ways. I now happily ride a number of rides I initially skipped. I've also helped a number of first time visitors to WDW, and they too, often change their minds. Sometimes they are bolder than they expected. Sometimes the reverse.
On my most recent trip, I expected I would not be able to ride most rides due to an injury, but it was pretty crazy - again both ways. A number of tame rides were difficult for me to board, but many thrill rides were unexpectedly easy to ride. The best was the crew of Velocicoaster. I didn't think I'd be able to ride it, but the crew there were super nice and encouraging. They even cheered for me when the ride was over. It was SO much fun. Their kindness made a HUGE difference.
A list is a great way to set expectations, so is keeping as much flexibility as possible. Just about every WDW visit includes multiple things we totally did not expect.
If you are looking for details about any of the coasters, try the rollercoaster database website. It lists facts for every coaster in the world, like top speed, duration, height, number of drops, manufacturer, etc. It has minimal pictures, so IMO, few spoilers. If he has ever enjoyed any coasters anywhere, he can compare the ones he likes to what WDW, Universal, Sea World and other parks offer.