I try to get it right in camera, but that's as much for my own satisfaction as anything else; and may also have something to do with growing up with film. Sure, you could manipulate the images during processing, but it was more difficult and time consuming, and you didn't have this option with slides.
I'm not obsessive about this. I shoot raw to retain flexibility, and normally use AWB which is easy to adjust in post processing, within limits. It's the final image that counts, and I doubt if very many people are concerned about how you got there.