Not to be seem like I'm raining on a parade, but a LOT of places would do this. I am glad the OP got his hat back, but to attribute it alone to Disney as having going the extra mile is a bit simplistic. Legally, most states require businesses that, once an item is reported lost, they must return it to the owner if it is found. There are procedures in place if the owner is not known, and vary based on an appraised value of the item lost. Believe it or not, it is actually a crime to fail to report lost items to the police.
However, that won't negate any extra miles Disney went to find it, i.e., if it didn't just turn up one day during routine work, but rather, they found it because they continued to look for it. Either way, at least they knew to keep an eye out for it and the OP got his hat back!