Depends on what you do. When I'm using LLMs to generate code for projects I need to maintain (basically, everything non-throw-away-once-used), I treat it as any other code I'd write, tightly controlled with a focus on simplicity and well-thought out abstractions, and automated testing that verify what needs to be working. Nothing gets "merged" into the code without extensive review, and me understanding the full scope of the change.

So with that, I can change the code by hand afterwards or continue with LLMs, it makes no difference, because it's essentially the same process as if I had someone follow the ideas I describe, and then later they come back with a PR. I think probably this comes naturally to senior programmers and those who had a taste of management and similar positions, but if you haven't reviewed other's code before, I'm not sure how well this process can actually work.

At least for me, I manage to produce code I can maintain, and seemingly others to, and they don't devolve into hairballs/spaghetti. But again, requires reviewing absolutely every line and constantly edit/improve.