Yes, EXACTLY! Hmm, I didn't realize moguls were formed by people going slowly, but it makes sense. And that makes it more annoying!
I've seen a few mogul fields, even had the misfortune of having to ride through one and it wasn't too much fun. I was forced to go slowly and I was very tempted to plow my way through that... maybe level it a bit :P
As linville said: "Moguls are Ullr's way of saying that too many people have already skied here"