I have these calves. I don't train them, they grow like weed from raw milk.
I like them, they're awesome! And when I do calf raises (with straight arms, like lateral raises) I get nice burn in my middle delts and traps too.
Oh, and if you raise a calf, you'll have a cow which will give you milk. And Milk makes EVERYTHING grow.
So yes, calf raises are quite important. :o)