Well, I don't know anything about the Earthquake, but I'll tell you about our experience with the Kitchen Sink -- it was fabulous!
I ordered it quietly, and my children had no idea what was coming. The waitress brought it out and carried it around the room announcing that someone had ordered the biggest sundae they make -- my children were straining their necks to see what it was -- their little mouths were watering. Then she brought it to OUR TABLE. Their chins could have hit the table. She gave us four little bowls, and we ate and ate and ate. It did get rather "melty" by the end, but that was okay -- it was still yummy! Afterward, I had to take the girls to the restroom to wash hands and faces. They kept saying, "Thank you so much, Mommy. That was the best dessert we ever had." Now -- six weeks later -- my oldest daughter is still announcing that her favorite ice cream parlor is in Florida.
It was definately a high-point of the trip. I wouldn't do it twice in one trip -- that'd be overkill -- but I would do it again on our next trip.