When I started working in the 70's, slide rules had pretty much been replaced by calculators. Although I still know how to use some features. All of our drafting was done by hand. I was fortunate to have hade three years of drafting and detailing in high school. In college, we had one 2-credit course on drafting. When I started work, engineers did full sized drawings in pencil and the drafting department made them look nice in ink.
I never got the hang of ink - I still have a ruling pen - even with a Rapidograph pen. I still have drafting equipment - T-square, adjustable triangles, dividers, compass, Ames lettering guide, French curve, protractor (or as one young engineer asked me a few years ago: "do you have one of those things that measures angles?")
In the early 90's I taught myself Autocad from a book. My boss didn't mind giving people the disks if they wanted to study at home. He didn't consider it piracy so long as it was for learning and not moonlighting. Of course, I was sent to field job and when I returned a few years later the office was using Microstation. Intergraph did a good job of selling their product to the state DOT's. In the 90's Microstation was a difficult program to learn. I eventually got the hang of it for what I needed - reviewing drawings and making minor edits.
Presently, I don't any CAD programs on my computer. I was told I don't need them as a project manager. I sometimes wonder about the need for CAD operators. For the past 10 years, where I was, the younger engineers have been doing their own drawings. We had some CAD people to assist those of use who aren't very proficient, but our CAD people weren't that good. Most didn't have any real manual drafting skills. They didn't have an eye for presentation or if something was wrong they wouldn't notice.
Now, after being sold again, the CAD people in the department I was assigned to are pretty sharp and produce quality work for the most part. However, I really don't know if the majority of engineers in our department do their own drawings.