I don't really like to mess with front-end stuff. Can someone explain why ember/angular are so amazing? What does it enable you to do so much more easily?
Take a jumble of jQuery that is continually updating the DOM via event callbacks and function calls and giving you structured code that wires it up in a smart way. In the same way you don't need a framework like Django or Rails, but server-side code tends to turn into a mess without one.