Interesting
I have noticed this too, but have a different problem
The "flow state" has never been where I want to be, it is where I make my worst mistakes and where the details swamp the bigger picture. A "cannot see the wood for the trees" problem
I am developing a practice for agentic coding, involving plans, reviews and check points. But the "twirling my thumbs" waiting for the agent to do its thing is a related problem for me