It's truly an amazing sight, our payroll system was all text based screens. I had a question and the clerk ripped through like 10 screens to get the information I needed, we're talking 200ms human reaction speed through each screen.

I also worked with a mythical 10x developer and he knew all the Visual Studio keyboard shortcuts. It was just like watching that payroll clerk (well, almost, we had under-specced machines and Visual Studio got very slow and bloated post v2008), I don't think I ever saw him touch the mouse.