I think this will continue....
Chuck,
With respect the subject of the thread is how to judge the flare, the crop duster analogy is for judging height above the ground so as not to hit it.
The above do not (to me) really imply the same thing i.e. in the flare you are intentionally making contact with terra firma - the aim/intention of the pilot is to accurately judge the rate of sink.
Out of interest, when instructing level turning where do you tell your instructees to maintain focus?