Does Asymptote get much use these days? I thought it was pretty cool, though a bit hard to wrap my mind around, when I first tried it, but nowadays it seems that attention has moved on to TikZ.
Not sure. I use it and it is reguarly updated.
https://asymptote.sourceforge.io/ https://asymptote.sourceforge.io/gallery/2Dgraphs/index.html https://asymptote.sourceforge.io/gallery/3Dgraphs/index.html
Kids who get most of the way through AoPS (typically) end up learning some Asymptote as that is the supported way to draw figures on the AoPS website
https://tug.org/TUGboat/tb44-2/tb137hefferon-asymptote.pdf
I found Asymptote interesting, but I'm trying to wrap my mind around METAPOST (and by extension METAFONT) as an easier thing to implement/use.