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.