Yes, I agree it's more hassle than a knife. I don't agree that it's more hassle than a box grater.
The box grater (in the biscuit dough case, just for the butter) fits into the top rack of my dishwasher along with the cups.
It is.. at least my box grater which can be folded out flat making it very easy to clean the inside with a sponge and a tiny amount of elbow grease (much like the outside).