I fully agree that pilots should visit an ACC at a busy time to see what the other half have to do. Equally, surely it should still be possible to arrange for ATCOs to ride on the jump seat to see what the pilots do. Back in the 1990s BA had a programme with NATS for doing exactly that. I have long since retired, but surely even after 9/11 it must be possible for the powers that be to arrange an official programme. Too many commonsense things like this have been sacrificed in the name of security.