I do this but with copilot. Write a comment and then spam opt-tab and 50% of the time it ends up doing what I want and I can read it line-by-line before tabbing the next one.
Genuine productivity boost but I don't feel like it's AI slop, sometimes it feels like its actually reading my mind and just preventing me from having to type...
I've settled in on this as well for most of my day-to-day coding. A lot of extremely fancy tab completion, using the agent only for manipulation tasks I can carefully define. I'm currently in a "write lots of code" mode which affects that, I think. In a maintenance mode I could see doing more agent prompting. It gives me a chance to catch things early and then put in a correct pattern for it to continue forward with. And honestly for a lot of tasks it's not particularly slower than "ask it to do something, correct its five errors, tweak the prompt" work flow.
I've had net-time-savings with bigger agentic tasks, but I still have to check it line-by-line when it is done, because it takes lazy shortcuts and sometimes just outright gets things wrong.
Big productivity boost, it takes out the worst of my job, but I still can't trust it at much above the micro scale.
I wish I could give a system prompt for the tab complete; there's a couple of things it does over and over that I'm sure I could prompt away but there's no way to feed that in that I know of.