Wouldn't you be incredibly annoyed?
Then think about how that irritation would be compounded by millions of people who find it necessary to bother you multiple times a day just to say 'thanks for the food', or 'thanks for another meeting' . Man, would that ever grate on the nerves! If you count up how many times per day each witness is supposed to pray, and all the prayers at meetings of any kind, you have the recipe for one very annoyed higher being.
One of the things I've always thought, especially about the say a prayer every time you eat thing, is that if God knows all and sees all, then he already knows who is grateful for what they have and who isn't. He doesn't need to be bothered all the time by people reminding him that they appreciate the food, just shut up and eat already!
Well, that's my take on it anyways. Nothing wrong with prayer, but whatever happened to moderation? It all just started to feel like habit and praying for the sake of praying after a while, and even though you were not supposed to say the same thing, I think everyone does after a while because there just are not that many ways to say "thanks for the grub and this day of life"