When I first started dabbling in the use of LLMs for coding, I almost went overboard trying to build all kinds of tools to maximize their use: parallel autonomous worktree-based agents, secure sandboxing for agents to do as they like, etc.
I now find it much more effective to use LLMs in a target and minimalist manner. I still architecturally important and tricky code by hand, using LLMs to do several review passes. When I do write code with LLMs, I almost never allow them to do it without me in the loop, approving every single edit. I limit the number of simultaneous sessions I manage to at most 3 or 4. Sometimes, I take a break of a few days from using LLMs (and ofter from writing any code at all), and just think and update the specs of the project(s) I'm working on at a high level, to ensure I not doing busy-work in the wrong direction.
I don't think I'm missing anything by this approach. If anything, I think I am more productive.