Why is WIMP convenient?

In fact, this is a small drawback Habra'a. I remember that there was a blog in which it was proposed to publish questions to the public on certain conditions, but I do not remember either its name or its author in order to find the blog ... Therefore, I’m writing to a personal, maybe someone will link to that wonderful offer.

So. Questions for user interface experts: why is WIMP so convenient? Or is it actually not as convenient because people are happy to use HTML pages as interfaces to all sorts of applications? Why? Does comparative analysis in nature differ from eternal WIMP vs. Command Line?

Here it is. If I type enough material on the topic I promise to write an article, as suggested in the blog I lost.
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UPD: blog found.