In our limited sample size, EasyWDW was exactly correct. And his explanations can help you use your own judgment - for example, if you are park hopping.
Touring Plans got one day horrendously wrong for us - EasyWDW had Hollywood Studios as _least recommended_ on a CL5 day, while TP had it as CL3 (which was lower than TP had other parks, so basically HS was most recommended by Touring Plans). It was a madhouse, and Touring Plans retroactively rated it as Crowd Level 8. Predicting CL3 and having it be CL8 is pretty unbelievably bad! This was in November 2014. The reason we decided to go to HS that day was because TP put the crowd level only at 3, and it was an EMH day, so we figured it would be okay. Big mistake. I guess you can give TP credit for recognizing the mistake after the fact - maybe they have improved their crowd calendar since then.