I've touched all airports (though LAX was only a connection) and agree that they are some of the worst around. However, they may not be all that bad -

MIA - The international activity really kicks off around midnight, so nightime may be one of the worst times for traffic. Though traffic on the freeways there is almost always bad. The local roads are a good alternative and can cut some time off the trip. Also, I've had just about no wait at the United security checkpoint.

BOS - even the public transportation there is horrible. Why not extend the train a few 100 yards so you don't have to take a bus the final way?

LGA - Cramped and old, but I had no trouble getting out and in to a rental car on my way to Westchester. (However, after that I flew in to HPN everytime. That airport has its own set of issues - one small security checkpoint and two gates, with a large number of flights. Even a long backup on the freeway to turn in. It could just about be added to the NY group)

One that should be added:
DEN - Its way out in the middle of nowhere. Rental cars are also miles away. Public transit there is barely existant (a bus). Yet once you go through secuity, you are REQUIRED to go on a train (unless in the Frontier terminal). Not even an option to walk like Atlanta. And when the train is 'running slowly' you may have to wait for a couple full trains to go by before getting on. Not many options to avoid this place. COS is a long hike. However, I did notice that Centennial airport had a near continuous stream of GA traffic. Looks like people have learned a good way to avoid the nightmare. Perhaps Boulder's commercial traffic will resume...