I believe deeply in creating intentional experiences. For WordPress plugins, a lot of that is figuring out the best ux pattern for the workflow. Some people like to work directly in the code, which has a lot of advantages. Others like to pull out a pencil and doodle on a napkin.
Personally, I like to work in an app called Balsamiq. When WordPress 3.0 came out I built templates for The Post Edit Admin Loop, The Comment Edit Loop and The Post Editor for Balsamiq. WordPress has continued to evolve and the admin has changed in a number of ways.
Here is the post editor updated for WordPress 3.4.1. Let me know if I missed any panels or details!