Disney for Christmas

Who has taken the kids to Disney?  Did you like it?  Did the kids enjoy it?  Is there a time of year, or age of child, that you would not go if you had to do it all over again?

I am thinking about Disney vacations for Christmas this year. Our youngest is finally old enough. I wanted to wait until she was old enough to remember it and she just started kindergarten so I think it's a great time now.

Two parents, four kids, and Mickey Mouse?  I need to look into how much it would cost us.  It'd be a great surprise for the kids.