Great topic! I am guilty of this myself, although I share my retro hobby time with motorcycle riding, so it goes in waves, and a lot depends on the weather
These days I find myself enjoying fixing and/or upgrading old machines. I think I spend most of my time with a soldering iron. The days of intense coding sessions are over, at least for now, and I've ventured out to other systems, like the TRS-80 Model I-4 line, MSX, and some older Apple II stuff. Amazing what the hobby market has created for these old computers, and armed with a 3D printer, there is no limit to what you can do with them!