The variety of situations in which being confident in my escape plan would be helpful is pretty high. The effort required to review a basic escape plan ("follow the route mapped out on the inside of my door") is pretty low.

I don't really need to know the odds of each specific reason I might need to get outside to determine it's worth a short walk to the end of the hall to confirm I know which door leads to the stairs and where I end up outside once I go down them.