By the way, I wrote my previous message after reading the essay at WebDesignerDepot.com, but without reading the comments posted below it by other people who I assume are also web developers. I have now read them.
I am very disappointed that I saw no comments about the original writer's technique of trying to learn things by watching an untrained user, or about what he learned by doing it. Instead, they are talking about their own reasons for preferring this or that browser, or this or that operating system.
Just like most of the people who posted to this thread, they are approaching it not as a psychological problem but a technical one.It seems to me they are missing the point.