We sit up front every trip. You just tell the CM at the head of the line and you will be asked to wait in a separate holding area. They will only allow 4 people at a time to sit up front and the last time we were there we received a card that read Official Co-pilots. My son loved the card. You may have to wait for the next monirail if someone is waiting ahead of you, but they come fairly quickly.
Have fun. It's a great view.