When it comes to writing code, I can almost tell before writing code that whether this particular piece of code will be intellectually stimulating to me. If so, I write it myself without thinking about whether Claude might have done it faster. If not, I let Claude write it. Currently I'd estimate maybe 70% of the code falls in the first category, and the remaining 30% is something I would've used a lot of my own willpower to get started anyways.

Also, when I write code myself, I still ask Claude to review it. It's faster than asking a human colleague to review it, so you can have Claude review often. Just today after a five-minute review Claude said a piece of code I wrote had four bugs, three of which were hallucinations and one was a real bug. I honestly do think it would have taken me a bit more than five minutes to find that one real bug.