Why is everyone constantly tossing (or banging etc) things when they're cooking? I'm usually very careful with my cooking ingredients and handle them delicately

Why is everyone constantly tossing (or banging etc) things when they're cooking? I'm usually very careful with my cooking ingredients and handle them delicately and with calm, measured motions. I'm especially careful when I'm chopping up things with a small cleaver or a very big knife, say, or when I'm frying things. I would never dare "bang" something in the oven (as I've seen a few recipes instruct).