Ooh jealous!! Yes, warm clothes. Mark sure you book meals in restaurants in advance. Definitely do cafe Mickey! Lots of characters and they come to your table.
When we went we got up early and went straight to park to take full advantage of magic hours, then came back and had breakfast in the hotel. Skips a lot of queues (we went on Its A Small World and just stayed on and went round again cos there was no queue)
Rides we loved (kids aged 4-12) - buzz lightyear Lazers, runaway train, small world, Pinocchio. DH and I loved rock n Rollercoaster, and tower of terror (we took 4yr old on that, at her insistence, she cried the whole time, awful! But then was mega proud and kept telling everyone when we got homes hat she had been on it!) get Fast Passes for the big rides, you get given a time and you go back at that time and skip the queue :-)
We just loved the whole experience, we met Mickey and Minnie mouse (short queue cos we went in Magic hours), saw the parade, just wandered sound and soaked up the magic. Kids loved it. We didn't actually go on loads of rides, just loved being there...
We went several years ago for new year, it was soooooo cold. But wrapped up in lots of layers and it was fine, and it had a real Christmassy feel to it (fake snow on main St etc!)
I think Cafe Mickey was my fave though, just seeing my kids faces when each character came to our table. Wonderful. And I got to eat stuff shaped like Mickey mouse. What's not to like?!!!
Have an amazing time. I'm hoping for a lottery win sometime soon so I can take the kids back again :)