The way I learned to love growls was to find a band that had interesting enough music (in my case, Opeth), and listen to them for the music. Eventually, the growls begin to grow on you, and you don't mind so much. Then you start to love them, and then you're growling "Heir Apparent" in the shower while everyone else is singing "Walkin' on Sunshine."
The reason why I'm giving you this advice is because what a lot of people who don't like growls but like the music understand is this: they are a complete package. Imagine Strapping Young Lad's "Oh My Fucking God." There is no other way for someone to sing that song and still make it sound good except in the gutteral, fast way they do it in the song. The reason there aren't many bands that sing cleanly with fast, super-heavy music like that is because it simply doesn't fit 99% of the time. I for one don't know of any bands that can do that. Like MM666 said, Strapping comes closest with a few of their songs (Love, Far Beyond Metal, Almost Again, and Detox, for starters), but its just a matter of trying to adjust to growls, I think. They don't turn me off like they used to, though if they're not done well (by my tastes, of course), then I can't really get into it.