I see you haven't gotten a reply yet, so for what it's worth - my boys LOVED the pirate cruise they took last year. It left from the Grand Floridian. They were 9 and 4 at the time. There were MANY young children.
How old are your boys? I felt much better about the 4 year old knowing his brother was with him.
I will also say that they handle the cruise my boys were on very well. I felt fine with it after seeing them leave on it.
Hope someone else can respond with more detail for you.