I just got back from TDR and went Feb 18-19 (Wed-Thurs, although Thurs was the lunar new year, so some visitors probably had the week off). I didn't think crowds were that bad, but I had nothing to compare it to and was expecting the worst. The two crowd calendars I looked at seemed to have conflicting views on the crowd levels for those days. However, I think that because February is a lower crowd time, some rides were under maintenance (although it seems because they do regular maintenance, this can happen at almost any time of year). But for instance, Journey to the Center of the Earth, Haunted Mansion, and the Little Mermaid show were down. Autopia was either just coming back from maintenance or about to go offline, I forget.
I came from a cold climate (New England US) and didn't think the weather was as bad as people made it out to be, but it can get windy. I was fine wearing several layers, although it can get cold if it's rainy or at night. In those cases I used disposable back and hand warmers for extra warmth.