I am currently employed by The Metcalfe Group, located in Solon, Ohio. My everyday experience can vary on an almost daily basis; some clients want sketch renderings, some want CAD models, and some want full-blown looks-like and works-like prototypes. The more experience one can get in a variety of different skills, the better of a designer they can end up being.
It's not just about working with your hands, whether it be sketching, rendering, or prototyping - it's also about thinking functionally as realistically as well. For me, ID isn't all about designing a pretty product, but also making it functional and understandable.