To be fair, depending on keyboard layout curly braces might not be printed on the keyboard keys, for example my macbook pro with SV layout gives no indication where they might be (and what key combination is needed)
I honestly don't know how any programmer uses these, all the additional key combinations needed, for simple things like #, are bound to be helping RSI get a start.
(Let's not start a war, I can't be convinced the mac keyboard is anything but awful, everyone is entitled to their opinion)