Well... I live with my girlfriend, so she sees first-hand just how *ahem* "interested" (read as "obsessed") in photography I am. She is actually really supportive of me... she gets excited for me when I sell a stock photo, she sits and looks at my favorite shots from a morning shoot, she encourages me to get prints made to hang in our house. Even if she isn't personally all that interested in the craft of photography, she takes an interest in what I enjoy because she knows its important to me... overall, I really couldn't ask for more.
There is one thing she can't stand: "Hey baby, I'm gonna park at this pull-off and get some shots of the mountains here" or "I really wanna get down to that river... you mind if I stop and go down there for 10 minutes." She isn't a patient waiter... AT ALL. And, hell, it's probably way too much to ask that she just sit around in the car while I jump around in a river gorge with my tripod.
So, as long as I fly solo whenever I go shooting, I get nothing but encouragement from her. Overall, I'm happy... since I'd really rather be alone when I shoot anyway, and the fact that she doesn't like to wait around prompts her to give me ample "me time" to go off by myself.
A win/win situation, really.