I agree to a certain degree with "abuse". But in a different way. Say you can book online and you do. How many on these boards change their minds a dozen times? Wouldn't that get confusing for us? "Let's see, I have nine dinners booked but I'm not sure about that one at the Magic Kingdom, let me look again. OK, I want to change that one, what is that confirmation number again? OK, I just canceled that one (I would imagine Disney online would NOT allow double booking) and want this one. What? I just looked and that restaurant had a booking for me! OK, I'll go back to the original one. What? That's full now?! @&*$^&$(^&"
So now you don't have the original booking and you don't have a replacement. And you are mad at the computer.