Good point, prompt engineering is going to be a very useful skill!
Prompt engineering appears to be similar to quality search skills. Learning how to use a search engine for instance, is a key skill that many engineers don't spend time on. I bet a bunch of people reading now don't know you can make sure a word is not included in a search, e.g.'javascript -coffee' or quote a word to make sure it appears e.g. 'javascript "dom"' or use the OR operator e.g. 'javascript OR ecmascript'. All part of the skill of searching, which I consider to be a "multiplier skill", multiplier skills are something where the value pays large dividends over time, much larger than the time invested. Good prompt engineering is going to be a key skill, both for image generation and text generation.