If you really hate the syntax quirks of javascript like me, a better solution is to just preprocess it. CoffeeScript has made me really enjoy writing frontend ui code again. http://jashkenas.github.com/coffee-script/
Typically I omit them if I can. And I have no reason to do so other than I think it makes the code look cleaner (I am often quite zealous on proper indentation / return lines).
I figure if using them works for you, rock on. If you hate them and don't use them, rock on. I really don't get bothered by debugging others' code either way as long as it is "readable-formatted" and works.
I've found that usually you fall into a situation where you have a company standard and have no choice in the matter though, and it doesn't even make a crap what your personal preference is.
Edit: To be fair though I only got "Eagle" on the test, but I chalk that up to only giving the test about 5 minutes of my time, too.