I couldn't count how many shots I've missed because of this, but it is finally sinking in. It is not enough to merely visualize the flight path. You must see the reality of the flight path. Dozens of shots where everything looked so perfect until, POW! "Where did that branch come from?"
A cheaper lesson, figured out in the practice field: There are occasions when throwing nose-up is good. The 20 mph plus tailwind was smacking down everything I threw until I hucked a Z Buzz that would have been a worm-burner if it hadn't left my hand nose-up. It got down to about three inches off the ground, and just rode a cushion of air like an air hockey puck. Of course, it only works if the grass is very short and the ground is moderately level, but that goes back to seeing the reality of the flight path.