There was one aspect of engineering drawing that I would have appreciated: circuit and electronic symbol/component sketching. Unfortunately, this was barely touched on when I did the subject.
Perhaps in sofware engineering you'd need to draw those flowcharts and system block diagrams. Of course, you'd normally use software to do that, but there are times when you are away from the computer, and you'd need to explain a concept to someone on paper inpromptu.
I saw a picture in a book once.. a technical sketch of a mechanical component on a napkin, next to a coffee cup (which means the guy sketched it while in a cafe of a sort). Thats pretty nifty
Wherever you are, you can express your ideas.