You don't notice the speed in hot keys as you build your familiarity with them, but after years of learning them, it's now painful to watch a good portion of coworkers use computers, as it feels like watching in slow motion.

The mouse dragging, the hunting for menu items, dragging the mouse back to where you were, over and over. It can really add up.

In the same vein, learning to create even basic macros and putting them on hotkeys, either in Office or something like AutoHotkey. There are likely things you go through the same motions to do daily, weekly, etc. Record the steps as a macro.

My old job had basic data formatting from generated reports and then saving the cleaned files to a specific name format and uploading them. Tedious and boring work. I created macros, and all the work was done in less time than it would take to type the filenames. Turned hours of work into seconds.