I normally wouldn't "push" someone to go, but just having returned from there last week, I would also say GO! Don't live in fear.
Also, Disney has taken amazing steps toward security. I know that security was very good before, it's just that it wasn't so obvious. Now, they check everyone's bags before entering the parks, and Disney Secuirty (who my boyfriend refers to as D.P.D.) and even Anaheim police were everywhere. Universal is installing (or maybe has installed them by now) metal detectors. We saw them when we were at City Walk last week.