I would suggest that you get there first to see what your mom-o-meter tells you. I saw lots of children that age roaming when I was at ASMusic ten years ago. I don't think that I would be comfortable letting my two roam, but I am judging that on who my kids are. I was allowed to roam as a child, and always went where I said I was going, checked in from time to time, and was very wary of strangers who seemed a little too interested in talking to me, so I guess my mom was comfortable with it. Just remember that even though it is Disney, they don't control who is there, so you should be carefully guarded. I have noticed an increasing trend of terrified parents who don't let their children out of their sight, most likely due to the increased media reports that make child predators seem like they are lurking behind every corner. Understandable, completely, I am one of those parents, I will admit.