We always experience 1 G of force downward; here we're talking about a horizontal acceleration. Normally you're experiencing no horizontal acceleration.
A possibility is that the acceleration is not constant; it might start out high and then drop off as the car continues down the track.
It's a nice, well-themed place, but the rides are geared heavily toward young children so don't expect anything too exciting. Personally, I don't think it's worth $47 (w/discount) unless you're taking the kids along. But I could just be biased by the fact that I didn't enjoy working there.