i was in the world from 11/12-19 this year. i would agree that it was crowded as opposed to my normal time of going (january). however, it was spotty. there were times scattered throughout the day where i would approach a popular attraction and there would be little to no wait.
now, i had a 4 year layoff from going recently due to grad school, so this was my first experience with FP+. the rumor is that FP+ has changed the game so to speak. i waited at least 10-15 and up to 40 minutes for PotC. I have never experienced that in all my adult life (approximately 10+ trips). i really hate crowds and it only got to me a little bit. i am sure it could have been much much worse. i will say i went on fewer attractions due to my lack of patience. i also think FP+ is a negative. there were no FP availability that i could tell later in the day. i am noob with it so perhaps it was my ignorance in using it as a planning tool.
the weather is generally very pleasant. i caught the beginning of that cold/rain snap that was mentioned earlier. it sucked bad. but i wasn't too unfamiliar with that weather given where i'm from and that i usually go in january where the weather is a bit more up and down and unpredictable.
i think the bottom line is we all will need another year or 2 to see if this 'never a down time' thing becomes a trend. i will be turning around and going back again in 3 weeks. so it will be interesting to see what the crowds are like to compare [i know i'm a spoiled brat for 2 trips in 4 months- don't worry though i'm paying for it in more ways than one]. anyway, happy new year, disney addicts.