My experience is the exact opposite. I find that CS removes a lot of the JS gotchas, and I'm not clear on the many ways that CS let's you do something, especially in comparison to JS. If anything it protects you a bit, by trying to enforce some of the "good parts".

http://arcturo.github.io/library/coffeescript/07_the_bad_par...

To each his own, but to me CS has been and continues to be a complete and obvious win over JS. 9 times out of 10 the benefit outweighs the annoyance of requiring a preprocessor for me.