Really? I don't remember properties going to auction that much at all - we pretty much bought every property we landed on back when my friends and I played 45-minute games of Monopoly all summer. In 30-40 games, I could count the number of auctions I saw on one hand (and we were in fact playing with them).
The true time-saver is trading as quickly as possible and buying as many houses as quickly as possible. That, plus the fact that we eventually had every space on the board and every property card memorized.