Sat down at 6am yesterday with a huge plate of 'one offs' and realized my old spreadsheet "todo" tracker wasn't cutting it any more. So I sat and explained to an LLM what I wanted in a todo program, and had it go back and for with me to refine a prompt to build one from scratch in VB.net
.net 10. In under an hour I had a prototype - In under two hours I'd refined it to add a multitude of features. At 9am I called it good. It is a full desktop app is commercial grade that runs out of my shared drive and still uses a spreadsheet format so that my phone/tablet still can mess with the data too.
I've done that a dozen times in the last six months. I have a pile of these little utilities that take a mess of old "make it work" (like using excel for a todo tracker) utilities and streamlined my workflow. In one case, I have replaced my 4 day end of month marathon of reports into two hours - all because of one-off utilities.
I try not to over due it because I know an LLM is probably going to be able to do the entire system better and faster than I can within a short time. Example, built a 'connector' that took gsc, screamingfrog, semrush, and other services and mashed them together for a 'dashboard' analysis of our marketing. It to a couple weeks write an get right. Claude introduced dashboards this week and completely blows away what we did in house.