Extremely! It needs to be taught extensively.
Very! it needs to be covered before a student moves to CAD.
Somewhat. It should at least be touched on briefly.
I don't really use it. it is a waste of time.
You mean, like, with a pencil and stuff? Why?
In my mid teens (a very long time ago! late 80's early 90's) I used to earn around £10 a day from my Dad dimensioning drawings for him in the garage, he had a huge drawing board in there and was a Draughtsman. Now he uses AutoCAD with a 15" monitor!