You can place proposals and mockups that deal with the organization of the GUI here.
Some of the issues:
- Blender doesn't communicate the hierarchy of functions well, or use the "Gestalt principles" well. Examples: The Mode switcher, one of the most important GUI elements in the program, is just one of similar looking list menus on the 3d View's header. The buttons in the Toolshelf all look the same, despity varying importance. The button the render out the scene is placed in the Render properties section of the Properties editor. Some unrelated values are placed as if they affect each other:
- Some elements are used wrong. For example the Unwrap, Extrude, Delete and Merge buttons look like a combo box (a box where you toggle between options from the list), but aren't ones:
- Certain categories in the Properties editor are overcrowded (Render, Object).
- Some of the GUI elements are occupying screen space while being rarely accessed - for instance Display/Shading options in the 3d View's Properties sidebar. Their placement also places the burden of keeping the GUI tide on the user. This issue was described by Brecht van Lommel here - http://youtu.be/ziPLNUfm7KA?t=4m9s
- Certain areas are disorganized, have low clarity, and so are discouraging to work with (at least for users unfamiliar with these sections). Example:
- There are no elements or layouts in the GUI that would guide the users that are performing specific tasks. Functions, which usage is required to perform for example Texture Painting, Sculpting, or Retopology, are scattered across the GUI, and so are difficult to remember.