These things are already prevalent at McDonalds here in Europe. There are multiple language options, a must in Europe. The print is not small and each option has an accompanying picture.
It provides the ability to add extra toppings or delete toppings (my wife always orders w/o pickles to enure a freshly made burger). From what I have seen, it does speed up the process, as each kiosk can handle two customers at a time (one on each side) and two kiosks are always open.
There is still the option at every McDonald’s I have seen here for at least one person to manually take orders and handle cash transactions (a must in Germany).
Your description applies perfectly to the kiosks here in Tri-Cities, WA, as well, except for the multiple language options. Easy customization, good interface with effective graphics, and one or two counter people always available.
Really, it seems that only people entirely unfamiliar with any kind of a “point and click” interface for whatever reason are unable to use the kiosks.
BTW, stores are clean and nicely decorated here and the employees are pleasant and helpful.