A mouse is an interface best suited for continuous-shaped requirement, e.g. aiming a pointer in games, drawing, and other inherently 2-dimensional arbitrary precision input modalities.

Textual interfaces (e.g. code), reading, navigating filesystems, etc. is inherently discrete (folders have files, files have words, words have letters). For discrete applications such as these, I (and many others) prefer mouseless modes of interaction. A mouse can point at many different precise points for a given character in a word, but it's still the same logical place.

(Yes, I'm aware that pixels are finite and thus the continuous analogy is "technically incorrect". Its validity stands.)