Hi Brad,
I agree with you about the trial and error method being low on the list. I really like your quote. It really makes sense to me as I think in many cases I am the "other people" as I try new strategies that do not work out near as well as I know they will when I am planning them alone at my desk in the late evening. Once they see the light of day and my students react to them I realize that once again I have learned something and that is not to ever do that again. Truly learning is life long. As they say "Once you get life figured out, then you die". Keep trying and keep observing your teaching peers and you will continue to grow as a professional.
Gary