Personally, i write my CoffeeScript with as much syntax as possible, to keep it as readable as possible: as a rule, I always use parenthesis and commas while leveraging CoffeeScript's "good parts".

But that said, the last couple of projects I've written in pure JavaScript and it's actually made things much easier to go back and read. Like the author of this post, I too have had difficulty reading back over my old code and, at a glance, understanding precisely what's going on.

Over the past couple of months I've gone from being absolutely devoted to CoffeeScript to on the fence, mostly due to readability.

(I'd love to see a fork of CoffeeScript that forces syntax.)