I've had a few school aged boys. While I did find them loud, they were actually pretty good kids! It probably helped that their younger brothers came here at the time too. They enjoyed being the "big kids" and helping me with them. They would pass out the sippy cups, plates of food, clean the table etc. They liked to push them on the swings, pull the wagon, play with them. If they got of hand and were doing inappropriate things than they would have a time away from everyone in different areas. This usually stopped the behaviour pretty quick as they were both social kids and liked to be involved with the group.
When I worked in centres, I dreaded the school age group usually. As they get older (more like 9-11 tho) they feel like they are too big for daycare and get bored easily because there is no electronics allowed. I've noticed that the electronic stage is much much earlier now. I would allow them to use their ipods and tablets during naptime and that seemed to help some of their loudness.