We just got back from WDW. Yes, there were security guards....they were in uniforms. At MK they were stationed at long tables before the entrance and looked through everything, asking you to open this or that. They were always very pleasant. At Epcot, there were guards as well, but at night they only had a flashlight and I'm sure couldn't see things in the bags very well. Still, I felt very secure during the entire time I was at Disney. The crowds were down, so the process never took very long. I bet the summer will be a different story.