I see loads of minimap feature requests here, so ......
minimap in WebStorm is AWESOME. It's a plugin called CodeGlance which is inspired by the minimap in ST.
It's actually useful with: side-column indicating lint errors by hovering cursor on to bring up summary; code view portal overlay by hovering cursor at location; other stuff. Very impressive.
While I love ST, I can't believe, in comparison, how USELESS ST minimap is.