Yup - as a cook, I can assure you every restaurant NEEDS a soft opening. You really don't want to be there when the new dishwashers and bussers are still trying to figure out how to stack the plates correctly for the cooks to use them and servers to move around everyone else - it's just not pretty when it goes wrong. And yes, it's a treat to all the other workers around - our restaurant hosted the soft openings for the chefs and families of the other restaurants in our restaurant group, and it's a really sweet thing to be able to serve the people you're with in the industry, since you've most likely worked with them before or will soon after.