I second this. Once one learns the keyboard shortcuts and builds the habit to learn shortcuts in general they won't be encumbered by small visual tasks like aiming lots of boxes like in menus and sub menus. These interactions micro-dent the flow. When I use the keyboard to navigate I'm not even consciously thinking what shortcuts to press, it happens naturally. I also noticed that I don't even know the shortcuts and have to think a bit before telling someone what shor-cut i use, my fingers remember them. All this said, the software has to have a good shortcut flow in mind. Not all software offers this benefit.