I
love talking to my partner, even though she's got an MBA (and works as an artist. Long story :)
It helps me improve my communication and teaching skills. It's fun, because it highlights the parts I don't clearly understand as well. She cares about it because it's so fundamentally different from anything she does, it's an entirely different world. (Vice versa, too. She's given me beautiful explanations on color theory, for example)
Yes, it requires work, from both sides. But for me personally - if your partner doesn't care enough to ask (or you don't care enough to explain), why have a relationship in the first place?
(Sidebar: s/girlfriend/partner/g, please.)