I think I understand what this article is saying. I call my day-dreaming, "War-Gaming". Not as in Call of Duty type stuff, but my mind is always seeing currently nonexistent realistic situations in my life and I think of how to deal with them in a realistic manner.
I can't say that it happens all the time, but often, when faced with a situation or problem, I find that I have already found the solution to it long before.
Beware the man who has one gun, he probably knows how to use it.