Documentation is foremost in User's minds, and last on the developer's list. I have spent thousands of hours writing, rewriting, updating and revising the Blender Wiki User Manual
. While it is an international collaboration effort, I wrote entire sections, for example on Compositing and Painting. In order to do so, I had to master the subject area, come up with examples based on commonly and frequently asked questions, and fully explore all of the options available. In doing so, I have become extremely proficient in many of Blender's features.