> I'm aware that this is from 1997-1999, but I'm curious: Do people still print out source code for better reading?

I know a bunch of embedded C programmers who have been doing it for a long time who do this regularly. They know their stuff. They don't print out the whole codebase, just a few pages of whatever they're working on, then they annotate it with a pen while thinking about whatever problems they are solving.