I personally do. However, I haven't been coding for decades. I learned just for my startup and mainly deal with frontend with my co-founder on backend. Still, it wasn't necessary for me to create icons. It is nice to know though. Plus, I enjoy design. I would DL inkscape (unless you have adobe illustrator) and get svg files of icons you like. See how they have done it. Most icons are very simple shapes. I personally think they are more effective when bare and simple. Its as simple as just drawing and connecting lines. Smoothing edges. And most of it is actually fairly precise / logical and.less artistic (I.e. no need to learn to draw). With time you'll get better. And you can create cooler and more complex icons, logos, and so on.

I shall definitively give Inkscape a go, and downloading existing SVGs is a good idea, thanks

I used to try to do that stuff, but it really is truly the definition of a waste your time. I mean, doing it once to get appreciation for the experts, and to justify the value of those things is worth it. But continuing to blast your head against the wall ends up being pretty worthless.

With the availability of Glyphicons, or FontAwesome, or the numerous cheap assets you can buy it doesn't make much sense to spend your time on an area you're not proficient in. (Unless you want to become a designer?)

My biggest motivations were having an understanding of the process, and being able to make something original, rather than just downloading it.

Yeah, I do all of that stuff. I started doing it initially because I couldn't really afford to pay someone to do all of it. Bought a book, got a copy of PS, and away we go. I'm not a good designer - very poor actually. I make up for it by going to Shutterstock 1x every 3-4 years, buying a monthly membership, and downloading 400-600 stock illustrations and graphics. I then take those and convert them to my needs. It's not great but it works "good enough".

I had an art degree and a bit of work designing logos for various projects before I got into coding, so at least for me, the process was reversed.

I'd suggest doing some tutorials on http://psd.tutsplus.com/ maybe, though I don't like how hard they're pushing premium content now, and I more or less deleted my own account in disgust after their passwords were dumped, I found them to be a pretty good resource.