"It's like going from having a 19" monitor with 1440x900 to a 24" monitor with 1920x1080."Ehh....I think you're overstating it, but to each their own. To make the comparison fair, you'd have to turn it into something more obtrusive: it's like going from a 19" monitor to a 20" monitor that's driven by one of those $300 USB video cards that gets really hot and eats up desk space and might occasionally cause RFI problems with my wireless mouse.
Or more directly, it's like going from Ruby to Python, or vice-versa, by using a tool that converts one to the other. They're different, and they have different syntactical features, but the annoyances of either language balance the benefits to the extent that I can't confidently exclaim that one is better. And the auto-generation step would just cause pain.
The critical difference here is that to use coffeescript, I have to add another (IMNSHO) annoying step to my build process. Another layer of indirection to obfuscate bugs. Another sprocket that can come unglued and bork my app at any time. No thanks. I'll stick with my current complexity level, and write my list comprehensions as loops.