This hasn't been for just McDonald's either. I seem to recall seeing a similar setup at a Jack in the Box location before McDonalds started implementing the kiosks. They ended up tearing out the automated kiosks because nobody used them and put back in another manned register because people ignored them.
I really wonder what drives people to prefer placing their order with a human being at the register instead of an automated machine. Personally I prefer the kiosks as a well done one sometimes shows options I didn't even know existed and its far simpler to review my order before sending it off. I've yet to have a bad experience with a kiosk, other than one completely crashing halfway through accepting the credit card making me wonder if the order was placed or not.