> "so that I may never realize I use something else"

The main reasons are:

1) ... so my muscle memory work. (In some editor Ctrl+Y is redo, in others no, I never remember in which editors, I hate when it doesn't work.)

2) ... so I can exchange files with coworkers, and they will see exactly what I wrote (I recently received an email with a draft and I complained about a missing ≥. It actually was there was the visor in Gmail was not showing it.)