My husband thinks I smell great ("earthy" was his word) when I come back all stinky from the barn. And he thinks I look super hot in my riding clothes.
He's not a horse guy at all, but he loves me like crazy and he appreciates my passion for the horses. He has an equivalent passion for MLB - I don't have a problem when he wants to fill up our DVR with baseball games, or spend hours traveling to/fro a game (or when he really wants me to go with him), and I've learned enough about baseball to hold a sensible conversation on the subject, and even know many of the players on his favorite team. And he is fine when I need to get up early to hit the barn for a lesson, and he doesn't complain about my stinky clothes winding up in the laundry, and he likes to come down and watch me ride once in a while, and doesn't mind when I inspect every piece of agricultural terrain we pass in the car for evidence of equines (and deliver a running commentary on the subject).
We get all this because we really love each other, and "really loving" means being interested in what lights your partner's fire, participating in it to some mutually-acceptable degree, and supporting what you don't want to participate in. If it was taking me away from him emotionally, or consuming all of my available time, it would be different. But I make sure that it doesn't (even though it would be very easy to let that happen!) and he makes sure that his baseball passion doesn't, and we're both good with it.
So yes, good partners are out there...it can be hard to find them, and having that kind of partnership takes a fair amount of work and commitment. But it's great when you get it!