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.
I love mikeal's work and contributions to the node.js community — but I didn't care for this bit of satire. Some folks legitimately enjoy the experience of programming in CoffeeScript. I don't happen to be one of them. But I'm also not one to pass judgement on other programmers' choice of tools.
Some people have been legitimately stuck using CoffeeScript because of rails or an employer or a client. These are among the people who will enjoy a lighthearted rant about CoffeeScript.
When did everyones sense of humour suddenly die? I literally can't get enough of CoffeeScript however I still think this is pretty funny, so the rest of you should be able to get over yourselves and laugh.
In my opinion, if you are still writing straight javascript you are stealing from your client/company.