I took engineering graphics at Purdue (took me a bit to get caught up with the boys, because I had to take home ec. instead of shop class) and many years later taught drafting at a homeschool coop. I also use my drafting tools when I teach geometry. I am a fan of literal hands-on instruction because it opens pathways in the brain that a passive point-and-click does not. I also teach math students using engineering paper and graph paper, not graphing calculators.
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Electronics and computers help you do things faster once you know what you're doing, but something about the physical activity of drawing and writing helps you learn the concept more thoroughly.