I haven't gotten anything more than a casual interest in the mellow side of Opeth out of my real life friends. The first time I listened to Damnation with my girlfriend, she said that they were really good, but she's really not into music as much as I am, and I can't fathom a girl like her enjoying extreme metal. She does however, work with a guy who likes Opeth.
Funny story, actually, and I wish it would happen to me. She was at work one day and he came in to pick up his paycheck... with an Opeth hoody on. She goes "COREY! COREY! (or whatever the kid's name is) YOU LISTEN TO OPETH?!" She said that his jaw literally dropped and he said something like "you know that Opeth is a band?!" I mean hell I would get excited if some grungy metalhead knew who Opeth were, but a cute little blonde girl who has no metal in her appearance whatsoever? How often does that happen?
Damn I need some Opeth merchandise to wear so random cute girls approach me about it. That would rock.