These Icons are good to have on your main toolbar since you can only access the appearance of Rhinoceros through the main menu then clicking tools/options / appearance, then your preferences. Therefore these commandscripts are great time savers for getting to that extra screen real estate quickly. This also helps when you want to see your model as large as possible on the screen either for viewing or rendering.
Toggle Menus on/off Icon
Toggle toolbars on/off with an Icon
Assigning a command script to a hotkey that toggles all your toolbars on/off