Why is this an issue? Is it really that important to get the privilege of sitting in a metal tube 30 seconds longer than some other guy? I can see being angry if it gets to the point that groups 6-8 are called early enough that they get on in front of you, because that is when overhead space becomes an issue. The airlines have hit marketing gold with this boarding thing. A "perk" that people will spend thousands of dollars a year to "earn" that costs the airlines nothing.

If I know the flight isn't full I usually wait until the line is gone before I get on.