Prettier and other format-on-save tools remain a huge quality of life improvement. I also think it found success because the defaults and choices outlined in the article were very wisely chosen: very readable in almost every context. The right tradeoffs were made both in printing logic and psychology with options/rollout.
One other subtle interaction that is hard to live without now: watching code shift with format-on-save is the fastest feedback on whether code will build/run. Don’t need to look at another console for a syntax error almost ever.