Very interesting.. Pilots that want to be rated for Cat II/III ILS landings have to perform them every now and then to stay rated, so I bet a lot of people have been through computer controlled landings without even knowing. Definitely whenever the weather is unmanageable, they have to turn over control already. Here's a really good example of something that would be very difficult for a human to do:

http://www.youtube.com/watch?v=TXJCHUmuUyw

http://www.youtube.com/watch?v=Fe_pEK_kRVw