I agree. Expanding your horizons is great, and if you get to do it with a loved one, that's even better, but it's not a necessary part of every relationship. I've dated guys who knew nothing about programming, and I wouldn't be ashamed to take them to company parties to mingle with my fellow programmers, and I don't look down on spouses I meet who don't program either, they're often interesting in a different way.
I, too, agree... for me, at least, I don't care that my wife really understands what I do (although she gets it to a point). For me the important thing is that she isn't bored by me talking about it :)
That is to say, while she doesn't really understand it, she will let me talk/vent about it as much as I need to. Just as I don't really understand what she does, but I'm more than happy for her to talk about it.
EDIT: Oops, typo.