Very true, an 'ol instructor pilot told me early on in bush flying ,..... "You must divert part of your attention now and then for a landing spot in case your engine craps out....." then he would pull the throttle at a time when the endless drone of the engine, the big lunch you had and your thinking of that date with Molly Moosejaw catches you woolgathering. Of course the wind is all wrong, or all you see are trees and rocks.