I'm a husband and father myself, and although I'm probably one of the biggest Disney Geeks alive (there is a picture of my in the latest
D23 magazine), I wasn't always this way. Here's some friendly advice.
I didn't actually go to a Disney park as an adult until I had a one-year-old and a three-year-old and I was 29 at the time. Before I had kids, the last time I ever cared about anything Disney was when I was about 14 and went to WDW with my family. I'll admit, when we were planning our first trip as a family I was excited, which is different than many of your husbands, but that doesn't mean they can't change.
1. Book at a time of low crowds and good weather. Start off in a comfortable and good mood. If you go to 90+ degrees with 99% humidity and huge crowds, just quit trying right now because it will be a lost cause. Even moms get frustrated with that kind of weather.
2. Find a character or collectable they can relate to. Do they remember watching Disney as a kid? Which shows or movies? Find something special related to that and give it to them as a gift on the first day of your trip. It can be pins, a nice piece of art, a t-shirt, or some other clothing item that doesn't scream Disney. Many men, including many of my married friends, can't let go or get out of their box enough to enjoy it all, so find something that can be put in the box with them.
3. Rides. Find something that they like riding on. It will make it more fun for them. Splash mountain, roller coasters, etc. This is hard with little kids though.
4. Food is a good way to get to a mans heart. Find a place that has good meat and he'll want to come back to Disney just to eat there again.
5. TALK to your husband AFTER you get to Disney about how you can be a kid again. Tell him to look around at other guys who can let go and have fun. Tell him that adults HIS AGE created all of this and it's OK to open up and just have fun... it's the only place in the world where everyone can be a kid and no one cares! Trying to explain this BEFORE you get there will be pointless, trust me. He will resist until he gets into the rides and crowds first. And just because you are a male who likes Disney doesn't mean you are gay!
6. Finally, be sure to stress how important this is to your kids. That your kids will remember this when they grow up, and that you want them to have a Dad that had fun WITH them, not just tagged along because he felt obligated to.
Very few Dads get into it as much as I do but don't let that stop you. Somewhere inside his heart is a kid somewhere still, I promise you.
Ethan