(1) No IDE can match (n)vim's coding speed. (2) Switching to the mouse is annoying. Dealing with lots of windows is inefficient compared to kb shortcuts. (3)

(1) No IDE can match (n)vim's coding speed. (2) Switching to the mouse is annoying. Dealing with lots of windows is inefficient compared to kb shortcuts. (3) If a large part of your workflow happens in a terminal environment, it feels natural to use it.