The code examples are actually taken directly from an early version of DocPad before and after tha javascript rewrite. We now handle these cases a lot better in terms of callback hell by utilising task groups with bal-util, however the issue of the readability and error proneness of the verbose syntax in javascript is key these code examples.
There is also a larger issue that I see at the core of JavaScript, which is detailed in the following email response:
Question: Would ES6's implementation of easier classes in JavaScript, make you consider moving back to JavaScript from CoffeeScript?
Answer: Well there are lot more issues in JavaScript than its current complexity with writing code.