When cooking burgers, do I need to wash my spatula after I flip the burgers?

When I'm grilling, or frying in a pan, I've always wondered if I need to wash my cooking utensils after touching the food, or if it's safe to wait until I'm done cooking? I've noticed that cooks in restaurants don't wash their utensils while cooking at all. I don't want to be OCD so what's your opinion? What is safe?