I think TP explained their 1-10 rankings something like this at one point (and I hope someone will correct me if this is no longer the case). They said to imagine that there are 365 marbles (i.e., days of the year) , each a different, unique size, from teensy to gigantic. Since they only have ten rankings, they would take the 36-ish smallest marbles (i.e. lowest wait times of the year) and call them 1's, the next 36 would be 2's, on up to the 36 largest, which would be 10's. I know it isn't precisely 36 of each and that the groupings are undoubtedly of varying unequal sizes, but you get the general drift. If you accept the premise that there are 36-ish days that are 10's, obviously some 10's are bigger than others. Christmas day and New Year's day 10's would be larger than spring break or summer 10's. But since they only have ten rankings, this is just how they have to group things, unless they decide to expand their rankings to 15 or 20 or 50. So all 10's are not created equal (yes, I get the Orwellian reference). A 10 just means among the longest wait times, but probably not THE longest, wait times of the year. And a dive into the touring plans site will show you exactly what they are talking about for wait times for the major attractions at each of those levels. As has been pointed out, there is really not a significant difference in wait times for just a couple of levels. And again, they are measuring wait times, which is just about the only objective measurement that can be done. How a crowd "feels" will depend on personal opinion and specific experiences in different parks at different times of the day. No one can really measure the "crowd," but I know people like to nitpick, because TP does refer to crowd levels and crowd calendars, so some will say the reference to crowd levels is deceptive. Maybe they should change their terminology, who knows, but any brief glance at their information will show that they are in fact referring to wait times.