Comment by wvenable

> because they have completely internalised the structure of the program and can think about it as a whole

This state is definitely how you can be most productive.

However, I've written multi-millions of lines of code and many different still active applications. It's gotten to the point where if someone asks me if an app has a particular feature, I have to open it to check even if I wrote the whole thing.

Not all projects I work on are one's where I still have the whole thing internalized.