That's a weird thing to say. GUI slows down me A LOT when I sometimes have to switch to it from my terminal for whatever reason. Where did you get your "absolutely no one" data point?
Anyway, my point stands. "Absolutely no one" without any context makes no sense whatsoever. There are a number of tasks that are much, much more efficient to perform in the terminal than in a graphical interface. So no, I didn't misunderstand your point - you're just wrong.
> any cases where a GUI is definitely better
Sure I can. Not all of them are though. So be careful with exaggerations.