I disagree. What you describe is a problem of interaction design founded on bad assumptions; with good interaction design I don't have to show the user that the computer is doing something for the user to be able to tell it happened. This is a problem of the system not showing its state transparently and relying on the user to notice a change in hidden state indicated by a transient window.Windows Explorer gets your particular example right: When you copy a bunch of files into a folder, it will highlight all of the copied files after it is done, so it doesn't matter if you saw the progress bar or not.
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