One of my peeves about flying in NZ and Aussie is the seemingly inordinate amount of time it takes to affix the air bridges to planes in our countries. Does anyone know why?

I have just spent three very pleasant days flying all over the US on AA (yes, it was actually very pleasant - couldn't find too many faults). What has struck me though is how quick it is to disembark from these planes. The pilot turns off the seatbelt light before turning off the engine and then, before you know it, the front door is open. On all of my 8 flights, the front door was open in less than a minute after the seatbelt light goes off. In NZ it always seems to take about 3-5 minutes and sometimes longer while they jockey the air bridge into position.

Does anyone know why it is done so much quicker in the US?