I read that as "re-run or refresh, as applicable", i.e. re-run a Go app or refresh a Node.js webapp. Besides, it absolutely can be a big issue with non-frontend development, so the point still stands.
Yes, that is why I specifically mentioned "re-run." About 75% of my work is actually API and backend data engineering work (Python Go, Node in that order). I do "save and re-run" less in that type of work, but definitely not enough to make frequent docker builds a hassle.