"Prompt engineer" didn't exactly make sense to me until a coworker (graphic design) talked about the prompts that he'd see in Midjourney's discord server. Particularly when he mentioned specifications around camera lenses and perspective and other things I'm not familiar with. Very specific choices, continuing to be added and refined.
Then seeing what guidance[0] is intended to do (LLM-prompt templating) it becomes obvious what people have in mind for this. It won't obviate understanding the lower-level code -- in fact, I expect the value of that skill to increase over time as fewer people bother to learn it -- but it will cut out the time it takes to scaffold an application.