Amazon lists several books about user interface design that received good reviews. Some books refer to Web designs, and others take a general approach. Keep in mind that a good graphic layout makes information easier to understand, but the overall "trail" someone follows to perform an action must have a clear focus and provide information that simplifies intuitive choices. I see that difference every day when I use the Macintosh "finder" and the Windows "explorer" to locate files.
The important points here center on a thoughtful approach to the design of a user interface, the use of well-organized and clear information and choices, operations that simplify a user's interaction with equipment, and a balance between the time needed to perform a task and its complexity. For me, the need to frequently "back track" out of confusing menus indicates a poor design. And if you create a complicated product, please write a comprehensive manual and a solid quick-start guide.