I could enter what we all here call the "Zone" quite often when i was young (once while doing math :D). I still can, but rarely on purpose, and rarely while coding. I have a lot of experience in this state, and i can clearly say that a marker of entering the zone is that your thoughts are not "limited" by language anymore and the impression of clarity and really fast thinking. This is why i never thought that language was required for thinking.
Now the question: would it be possible to scan the brain of people while they enter the zone? I know it isn't a state you can reach on command, but isn't it worth to try? understand the mechanism of this state? And maybe understand where our thought start?
That is, until the code refuses to work. Then the code is a bitch and I need a break.