Let's face it, there are a lot of IFR procedures we don't use in our everyday flying. If you're an instrument-rated pilot and fly IFR all the time, how many times have you flown these procedures in the past 12 months?
Class G airspace is the only form of "uncontrolled" airspace in the United States. It isn't charted, and it exists wherever Class A, B, C, D or E doesn't.