My boss told us to search for a jQuery Extension for ASP .Net MVC to make the development easier. After minutes of searching the web I have found two extensions that you and I can use:

1. DJME 2 which is an free and Open source
2. Telerik Extensions for ASP .NET in this case is a paid extension

Both extensions utilizes the creation of custom helper to make jQuery development quite easier but abstracted. Abstracted because you are learning how the extensions should be use to produce jQuery but your not really coding jQuery. 

So in the end, I will still recommend using jQuery it self, doing all the hard works of creating the JavaScript file and code all the way, so you can produce the right jQuery output you have ever wanted.