KFC, McDonalds and Taco Bell all have kiosks in our area and I use them rather than talking to a server. It's cut down considerably on screwups, especially when you have special orders. It's great, I don't have to deal with anyone really, except the person giving me my order.
Not sure how well the KFC or TB kiosks work, but McDonald's and Wendy's are SLOW. Also, they don't let me order things the way I want. It is hard enough to get an employee to understand I just want the Large drink in my combo, but not the fries. The kiosk at my local Wendy's won't let you do that.