There are so many examples in that book where users, frustrated or inconvenienced by the (high-tech) complexity of their tools, devise their own (low-tech) way to use a tiny subset of the features that just barely gets the job done for them--though perhaps not as creatively as writing on the screen here. One is the emergence of scrappy post-it-note instruction guides for basic tasks people would tape next to overengineered phone systems in the 90s. He also presents the concept of a 'gulf of evaluation' that makes contextualizes the difference between designer expectations and actual use (or the difficulty of getting feedback that would bridge this gulf).
The book---in its latest version, intentionally---omits discussions about modern software, but it does more than enough to prove its point with simple everyday examples. I'd highly recommend giving it a read to anyone!