According to this study by Sirota Consulting, meeting planners with too much on their plates actually are a pretty happy lot. While the most satisfied were people who had just the right amount of work to do, those who had too much to do were right behind them in satisfaction levels. Those with too little to do were the least satisfied with their jobs.
So that's why I'm so slap-happy with my work--there's too much of it!
(Thanks to Gary for the pointer.)