I'm going to hijack this thread for some related opinion (sorry): For those who _did_ get a CS degree, what things you learned from it do you use in your curre

I'm going to hijack this thread for some related opinion (sorry): For those who _did_ get a CS degree, what things you learned from it do you use in your current programming work? and how? Edit: or rather, what is the single most important thing you would want self-taught programmers to know about, that you find most don't?