We were there this same time frame last year. It was extremely crowded that Friday but the weather was nice and warm for the first time in a while (cm told us that) so that may have had something to do with it. The crowds didn't really pick up too much until after lunch, then it got crazy. We ended up going to DCA that night for the Electrical parade and the crowds were much better over there. I would plan on getting there as early as humanly possible (30 minutes before park opening is best). Many of the locals will be working and in school and that helps with crowds during the weekdays. I have to say that Saturday was the worst day crowdwise I have ever seen at Disneyland. This time of year, especially if the weather is nice, you can expect crowds to be enjoying the holiday decorations and fun atmosphere. I would think the 50th would increase that factor. Have a great trip!