[shaggyfrog]

To paraphrase Torvalds, you've been brain damaged by standard Windows button UI.

Mac OS X takes the approach of labeling buttons with action verbs instead. This makes scanning dialogs much simpler; with Yes/No/Cancel, you have to carefully read the dialog message (and hopefully the text is clear) so you make the right choice; or you sometimes make the wrong choice since nearly all dialogs use Yes/No/Cancel and your brain didn't do branch prediction properly.

In your case you are annoyed since perhaps you know exactly what the app is going to do and you don't want the extra 500ms overhead, but for your Average User, clearly defining a button's action is better.