But nevertheless, I would happily take up his challenge: let's find a word that is in the document, but not currently on-screen - hardly an 'edge case', more like 'routine task'. Good luck at winning that one, mouseketeer!
Another great one that sees regular use at my fingers is ci' or ci" - again, hardly an edge case, and blazingly faster than selecting the characters just right with the mouse.
I have no problem with using the mouse for certain things, but blanket statements like the quoted one are rarely anything but wrong.