Probably worth posting the links, because some of the responses there seem to provide both sides of the discussion very well:
The original quote is from:
http://www.lotustalk.com/forums/f3/well-i-ruined-autox-125107/
Another earlier thread on the same topic:
http://www.lotustalk.com/forums/f99/your-local-autocross-club-fun-boring-117919/
Best comment supporting autocross:
There are 2 ways autocross is superior to track days though:
1. It is an actual race
2. really the only venue to safely explore the cars ability 100% and beyond
If you are a very competitive person, these 2 items keep you going. I know people that drive 1500miles for 2 min of driving.
Imagine an olympic athlete. He may train his whole life for a 8 second sprint or 1.5 second lift.
Autocross is 6 runs of 50 seconds of panic maneuvers around 60 MPH. When done correctly, it pushes the driver and the car to the limits of ability, cornering, acceleration, and braking. There is no warmup, you line up, run, and that is the time. It provides enough safety margin that the driver can screw up without injury or damage to the vehicle. A complete novice can participate without any concern.
It costs $25-45, and to keep the costs low, everyone works as long as it takes for everyone else to participate.
Track Days, HPDE/PDX, Time Trial, Road Racing, all involve much longer durations of participation and higher speeds, but do not push the driver or the car to their limit for the full duration of participation, and probably not 5 honest minutes of at-the-limit for either the car or the driver. Higher speeds involve more careful and smooth maneuvering. Wheel-to-wheel racing would also involve strategy, stretching out a lead, backing off when a lead is sufficient, and just making sure to finish in front of another car without risking breaking or wrecking. Several of these involve warmup and cool down laps. There is less safety margin for screwing up and much higher chance of injury or damaging the vehicle. There is a certain level of expertise required and these events are less open to novices.
It costs $150-350+. To keep participation time high, there are paid and/or volunteer track workers.
There are worse alternatives:
Drag Racing Test and Tune:
$25+ for five or six 15 second runs. Those of you with faster cars pay significantly more per second of participation.
Many more hours waiting in the staging lanes.
Watching NASCAR, F1, Indy, Cart, Lemans, etc.
Hundreds of dollars to get in, and they don;t let you drive at all.