I am indeed lucky, as I met my wife in advanced music theory class in college. She's a classically trained mezzo and does both soprano and alto work in church music. As I type this, one of her groups is singing for a function right now (her duo with another soprano, piano accompaniment). She gets it. She's in rehearsals more than I am (at least 2 nights a week most nights for her), and she performs out more than I do lately. She did get me involved with her duo so that they can take breaks during performances while I either play guitar or trumpet.
Yes, my wife is very supportive of my music, and was actually upset with me when I wasn't in a band. She's still pissed off that we're not playing any clubs right now. She bought me my Telecaster last year for our 10th Anniversary present and surprised me with it. She encouraged me to buy my Highway One Strat a few weeks back. She's a great girl, especially about music.
For those of you out there who are single and looking for a woman--find a musician. There are diva issues, but at least no hassles about you going to rehearsal or playing out.