I started my career in 2008.
When I started in 1981 in the aerospace industry, the drawing offices consumed huge amounts of office space with all the drawing boards and draws for storing the drawing masters. I still have all my drawings from the drawing training school too! The time it used to take to draw simple parts and specifically draw spines with a pile of weights to hold a long flexible 'edge' in place. All the drawings were done on plastic drawing film, so that they could go through a UV 'copier' to generate the 'blueprints' the fab or assembly workers could work to.
The arrival of CAD and the early days of Catia, reduced 6 drawing offices in our factory to a single office of workstations. Design also changed from drawing, manufacture part, test fit and access in a mock up to all being done in a virtual world ... with more accuracy and speed.
After using CAD for the last 20 years, It's hard to believe the way it used to be done. Still got the rulers off my old drawing board (and all my Rotring ink pens, pencils and text stencils), but instead of drawing with them, I now use them for measuring things that I then CAD up ... in Alibre!