exactly this! You can do things nearby with one prompt which would have taken weeks before to tinker around; esp. ClaudeAI is very good with "give a detailed first prompt and some context sourcefiles and create a working example on first shot".

E.g. I have to deal with lot of reports and those are usually "never fully developed" because "we can add this one row/feature later" because "management want us to ship early". Now I can enhance our reports by whatever metric just by handing over a current XLSX-exportcode and tell the LLM: "now i want additionally XY here...."