I love Excel! The best part of my job is where I get to use Excel. The worst parts are where I have to use power point or interact with other people. Sadly, most of time is spent on PPT and interacting these days. :(
True, watching other people use Excel is painful. I used to have a coworker that was so good at Excel that she didn't use a mouse at all and was way quicker than anyone else. She made me feel guilty whenever I was the one being watched because I knew she must be frustrated watching me do things with shortcuts and the mouse.
This could be a typewriter holdover. I have vague recollections of some shitty '70's typewriters having only a caps lock (or rather shift lock) toggle to save on two keys. I might have hallucinated that, though. It's been a while.
Or she is just being obtuse. I don't know how old you two are.