I use my minimap sometimes. Some people are just more visual.

Like, if I have a big file that has a class somewhere, and I know I took a bunch of notes on it, I can scan the minimap for the big block of green comment text, and click that section to jump directly to it.

Regardless, I'm not really short on horizontal space in a world where monitors are huge and 80-character lines are still the norm, so it costs little to keep it there.