My old Amiga 500 was set up to run entirely through CLI. I had a menu system, with Directory Opus being the main tool, with MessyDos running in the background treating DF1: as the pc drive. Everything seemed to run just a little bit quicker, because I had not booted into Workbench.

Ahh, those were the days. Somehow I could not imagine going back to that set-up nowadays.