Ditching all the useless lines of closing brackets and parenthesis is my favorite part of using coffeescript. Matching up brackets is a pain. The less I have to do that, the better.
My editors have had bracket/parenthesis matching for 30+ years, and automated indentation support as well. I don't get why anyone would do that manually.
Also if it works good, you can give them the same color as whitespace, which I always show, but with almost the same color as the background. This reduces the cognitive overhead a bit.