When we visited in December (8-16) last year, we wanted to see the gingerbread house at GF.....decently big mistake. We had to wait to get back onto the Monorail to head to MK for 45 minutes... Only to get off and do security again. I am all for the security but they need to get a handle on how the Monorail resorts does security screenings. When you have large crowds being funneled down to a single file line for the metal detector, that every one had to go through, it creates a madhouse.
Another one to make note of was the boat transportation from WL, we got off the boat at MK go through security at the dock (everybody through the metal detector at both areas), just to go through security AGAIN just feet in front of us.
Every park except MK was "random" selection, MK everyone went through metal detectors. And that might just be because of the holiday season, but I do not know.