I just tried this in July and it worked..
1. Abandon your stroller before the show if you rented one. Otherwise leave it in a place away from the theater(like another attraction). If you have your own stroller and your kids are old enough, leave it at the hotel this night.
2. AFter the show, stay in your seat for an extra 5 minutes.
3. When the mad rush dimishes, walk down to the first row of seats and walk right all the way to the right side of the amphitheater.
4. Exit to the far right. Crowds are all but nonexistent.