One of the motivations for toolbars (and the ribbon) is that there is a large group of users who never look inside any menu. Many users do not know about Undo.

One of the motivations for toolbars (and the ribbon) is that there is a large group of users who never look inside any menu. Many users do not know about Undo. Many word processing users are unaware of things like tab stops, automatic indentation, line spacing, and styles. I have known an otherwise intelligent user who did not know that the shift key could be held down to get a capital letter - they used the caps lock key to get a capital and turned it back off after typing it. It's pretty amazing what is not obvious.