CoffeeScript has made me 10x more efficient in writing web application client code. The debugging issue is minimal since there is a 1:1 relationship between your code and the js. If you can you 'find' you can debug. I've never written a line of Rails code.
In my opinion, if you are still writing straight javascript you are stealing from your client/company.
In my opinion, if you are still writing straight javascript you are stealing from your client/company.