I took some AutoCAD courses in the late 90s, trying to find a niche other than working on an ambulance at the time. I took the 2D course then the 3D course and it was a lot of fun. The professor told me I should find a job doing it as I had a knack for it. High praise but I never pursued it.
The idea of these people hand-drawing precision machinery and complex systems blows my mind.