[esafak]

Isn't it the opposite; use proportional fonts in the terminal but not code, where alignment matters? I am giving it a try, and I like it on first impression.

[babypuncher]

Tons and tons of terminal apps are written assuming a monospace font. Alignment matters and you don't have much control over that.

In code, you can always choose a style that discourages spatial alignment.

[Jaxan]

Alignment in the terminal matters. Even something like ls uses columns.

[fainpul]

Terminals usually don't support proportional fonts.