Probably a helluva lot more than folks learning how to use the keyboard for commands rather than searching menus for buttons to click. Highlight your text to be formatted. Ctrl + B for bold. Ctrl + I to italicize highlighted text. Ctrl + U to underline. I'm in the IT industry and you wouldn't believe the folks who actually use the mouse to cut and paste text (rather than use Ctrl + X, C, V).
You've got to be kidding. Using the mouse with right clicks to cut, paste and copy is a lot easier. I can drink my tea while doing that.