Is blowing on food really effective?

Just wondering, when you have a really hot cup of coffee or tea, is blowing on it worth it? If giving it cold breath a couple times will only bring the water temperature down an unnoticeable amount, then it's just better to let it wait in room temperature. Same applies to meat or vegetables.

All wrong. In a room there generally isn't any significant air movement, and air is rather insulative. By blowing you're moving away the hot air directly above/around the food/drink and replacing it with cooler air from the environment.