Well, I don't think we did anything wrong. We were in the parks September 14-September 19. We were at the parks at rope drop, took an afternoon break and returned for the evenings. We used our magic bands and fastpass+ and also pulled regular fastpasses with our cards. We rode everything we wanted to. I was just surprised by how crowded the parks felt, especially since the parks were mostly 1's and 2's for our days. As an example, we ate at Columbia Harbour House in the Magic Kingdom during an off time (around 1:30) and the lines were very long. Our longest waits seemed to be for meals (had a fastpass+ for Be Our Guest though so no wait there) and for character meets (the ones we didn't have fastpass+ for that is). We waited 20 minutes to see Sully and Mike and almost 30 minutes to see Princess Sofia at Hollywood Studios and we were there on a recommended day according to easywdw.
We had a great time and, as I said, did everything we wanted to do but I still wouldn't call the parks uncrowded. I think a lot of people see crowd levels of 1 or 2 and expect not to have to navigate through crowds. It's not true, at least according to what we experienced. We are going again in two years in early October and I am prepared for the parks to be more crowded then.