As a waiter, you do have power to some extent, but not much. You can burn the other wait staff by holding up the placement of your orders, thus bogging down the kitchen. Usually not done on purpose, but either way, it won't make you popular. You can cause the cooks to rush orders and frequently make mistakes.
If the restaurant is really busy, your manager just ticked you off, and you don't feel like working hard, you can slow down the pace at which your guests wrap up their meals. It means less turnover for you, less money coming in for the restaurant, but at least you aren't fried at the end of your shift—even if half the food on your restaurant's menu is. You can give the kitchen staff problems by constantly recommending the most difficult dishes on the menu. Just a couple of these can result in a kitchen slowing down enough to affect the pace of other orders going out. And then, there's always the power over the guest. If he's nice to you, you respond in kind. If he's not so nice, watch out! As anybody is likely aware, there are tons of ways to exert your power over an obnoxious guest. "Waiter—there's a loogie in my soup…."