Smythe,
Thank you for that!
My personal experience with a wing vortex was when I was jogging on the perimeter road near the threshold on a light wind day (back when that was allowed). I heard the vortex before I felt it, but the experience literally blew me away. Since then I have visualized the vortex as descending from the wingtip (as the dark line in your diagram) and that has kept me out of trouble. It’s not just the public who like things simple,