My ex husband had a super strict NO BUFFETS rule. I thought it was a bit odd, but I had no idea how right that man was to have that rule. I'd only ever been to higher-end sushi buffets where you could see everything, and a Ponderosa once or twice as a kid during a Disney vacation. Six year olds don't care about hygiene when they're all hopped up on the mouse.
Fast forward a few years to my very own Disney vacation. My children (the oldest was about 7 for this) really wanted to go to a buffet. Since Daddy wasn't with us to act as a buffet-blocker, we totally went.