Touring plans has always been clear that they are predicting wait times, as those are about the only concrete things one could calculate. One person's uncomfortably crowded park is someone else's moderate crowd. Trying to judge crowd levels by how many people are in the parks or how crowded it "feels" is just too subjective. A reasonable person can pretty easily extrapolate that, when wait times for very popular attractions are two or three hours, the park will be pretty crowded by anyone's standards - walkways will be congested, counter service eateries will have long lines, and parade/fireworks viewing areas will be packed. And I think that what many people really mean when they ask how crowded it will be is how long will they have to wait in line to see what they want to see. At any rate, it's the only thing that can be objectively measured to any degree.