We are going Dec 17 too!!!!
We are staying at the Poly this time, but we will for sure go over to WL.
The tree at WL is AWESOME. Santa was sitting right in front of it, and was totally the real thing (iyswim)
There was no line at all when we were there, so no photographer, but I am not sure that is still the case. Maybe they have photographers when there is a line?
I took some awesome pictures myself though. And my son loved it. He is autistic, and was scared of Christmas (didn't even like decorations or presents!) until our WDW holiday. AND, the CMs in the lobby (we were staying at the WL) gave him milk and cookies to leave for Santa in his room on Christmas Eve!