Howdy,
We visited Busch Gardens, Seaworld, MK and Epcot in our last trip. All had similar arrangements whereby they looked into your back, poked around with a stick if they actually touched anything, and requested you to move things if they didn't.
One troubling thing for me was when we park hopped from MK to Epcot. We carried our souvenier bag with us, in which was a boxed picture frame. No request to open the box or verify we didn't have anything 'illegal' in the box. The box was more than big enough to carry almost any pistol or incendiary device.
Makes me wonder what security I did miss, or if the bag-check security is mainly for show to placate a nervous traveling public.
Hope this helps,
Joe