Here is a funny episode with a JFK ground controller and numerous
aircraft taxiing on the ground. Ground control at busy airports
like JFK is the busiest and most complex position in the tower.
There can be a hundred different taxi ways and most of them are
crossing runways or very close to it. One wrong turn by an
aircraft can lead to disaster or just a nightmare like this sound
clip: http://home.online.no/~chainly/JFKGround.mp3

My daughter is in Oklahoma at Air Traffic Control school.
No wonder she chose Enroute Control! Wow.