I've gotten to the point that I don't usually leave feedback, until I receive feedback, especially when the other party has received more feedback than they left
I am a firm believer that the seller should be the first one to leave feedback. They are the first to be "satisfied" with the deal. Just an old habit that I picked up in the early years of Ebay. On a trade, whoever gets home first should leave first feedback. But, like you, I have gotten to the point of waiting to get feedback before leaving feedback.