Does using curly braces go against the “Ruby way”?

I've been using Ruby for about two weeks, and I've not been programming for too terribly long, but I'm coming at the language from a C-style background (C++, C#, etc). Anyway - a good friend and mentor of mine was looking at some Ruby that I'd written the other day, and he told me that he'd smack me if he caught me using curly braces in Ruby again.

Well, I just found out about Builder yesterday, via this About.com article, and the example that they have posted uses curly braces. Is there a different way to do this, or do you have to use curly braces with Builder?

This may seem like a minor point, but I'm new to Ruby, and I don't want to let myself develop any bad habits. What do you guys think?