When I follow, I find I'm spinning every third move. This is partly a Melbourne thing - the leads stand around a lot waiting for the follow to finish making them look good. They don't make much constructive use of horizontal (lateral?) space - perhaps a result of our relatively crowded dance floors, but most probably because there's a very particular dominant 'lead culture' in this town.
When I lead, I very very rarely do spins myself. It's directly related to my other life as a follow - I just get sick to death of the stupid things.