[alptrv]

Usually most of the people realise the need for this kind of tools when they are facing a need/requirement to develop a single page web application (SPA). If you don't need to make one then it's ok to use jquery or even add some PJAX to make your web site look more snappy. But if you have to develop a SPA, then you can't go far with jQuery because it just wasn't created for this type of things, you have to think about models, templates, about application state management and all other stuff, this is where frameworks like Ember and Angular shine.