My two cents is comfort with security is a very personal issue, and that makes it virtually impossible to ever say enough to make people comfortable. In the process of disclosing more and more you do usually lessen the effectiveness of security. My background is computer security, which is definitely different than physical security in many ways, but all security shares many core principles.
Based on the personal nature of the evaluation, we each need to arrive at our own decision as to whether they are doing what we want and then decide to go to the parks or not. For me, heading down to the World in just a few days, I have no reservations at all. I realize they are doing everything they can and with hundreds of experiences with Disney personnel over the years in many visits and many scenarios they have earned my trust and belief (which certainly could be erroneous) that Disney does a better job at everything than almost any company I know. This trust extends to my belief that as a private security force they are one of the best in the world. My "evidence" of that is watching how they interact and respond to incidents, such as the recent alligator attack. From the reports I have heard they had personnel there in minutes. I do understand there is a difference between being reactive (as that was) and proactive, but as President Obama pointed out with the nightclub shooter, we have to be right 100% of the time, they only need to be right once. Perhaps it is this understanding that makes me more acceptable of the realities of security. It is impossible to make something 100% secure. There is a cost associated with any security process and at some point it is not reasonable to incur that cost for the incremental improvement that may occur. Pushing security out further and further from the gate is an example. Other posters have commented about how someone does not need to get into the parks themselves to cause a problem. So do you now scan vehicles before they even enter the property? Do you check everyone before they get on Disney transport, before the enter a Disney hotel? If one thinks it through the magnitude of the effort and the issues it causes in ability to function where Disney moves from an entertaining place to visit to an exercise in futility is very simple to get to and the added security is incrementally not worth that hassle.
Uh, no. If they elaborated then it would no longer be secure. 
