Just that really.
It is a couple of years since our last holiday in France and I can't remember seeing them. Usually we wouldn't be looking to buy them anyway as rented gites always seem to have a BBQ. In fact the one we are going to this time does. However, DH rather likes doing a cook out on the beach sometimes and the disposables are perfect for this.
(And yes we do take it away with us and make sure we leave no rubbish 
)