I have a coworker whose default mode of thinking is to manually type everything. He knows about things like tab completion and copy-paste, but for some reason those two things just aren't baked into his brain as a natural reflex like it is for most people. Like if he has to put a URL or database connection string in a config file somewhere, he'll start manually typing the string one character at a time, and will keep alt-tabbing between the config file he's editing and the email or whatever that has the reference string.

It drives me up a wall.