I'm using it to display analytics. The page has various controls to view different metrics with different filters etc. there's a single chart which updates as you change settings. The backend is super fast so the chart updates almost immediately when you change metrics/filters. Our users absolutely love it, it's so much easier for them to learn the interface when the feedback loop is so quick.

Have your objects update from a form fields without having to select each element, assign it's inputted value to your JS object.

Turns 50 lines (if you're lucky) of JS into 0. (with about 10 characters more markup).