Hannah,
We have been to DLP at Christmas time a number fo times. In fact we are going again in the 1st week in December.
We have always enjoyed it and found that it marks the start of Christmas for us.
In previous years they have done a wonderful job in decorating the parks and hotels for the Christmas period. The parade also changes to a Christmas theme and several of the shows are changed to reflect the XMAS season.
One thing I will mention, it can be very very very cold (so cold that I don't mind admitting that I actually wore thermal underwear !!)
We were very lucky last time we went as it snowed, and the parks took on a very picture post card look. One night it snowed during the electric light parade, and words nor pictures cannot describe how magical it was.
Depending on when you visit the crowds are either very light or very heavy. As mentioned, we are going again in the begining of Decemeber mid week so the parks are quite, but we have been the weekend before xmas and it was very very busy.
Anyhow, enough of my ramblings - I hope you enjoy your trip !!!
Regards
Macca