Grilled cheese is cooked on a flat top grill/griddle, most people use a pan in home cooking because they don’t have a flat top or it’s just easier for a single grilled cheese to use a pan. Reubens and paninnis are other sandwiches that are grilled. You could probably argue that grilled generally means cooked at high heat. Then there’s pancakes which are more commonly cooked on a griddle than a pan…