It's just a matter of having the appropriate level of perspective. If you're in Florida and thinking about Oregon, you need a map of the United States. But if you're on 42nd Street in Manhattan and trying to find a restaurant, a map of the United States is of very little use to you. Just try to make sure the mental 'map' you are using to take in and process a given situation is the right one to have for where you are and for what you need to do.
An excellent explanation. Just to bring it home, all the parts of gtd, the workflow diagram, the natural planning model, the horizons of focus, and so on, are "maps" in that general sense.