I was surprised at the comment that at Boardwalk was not for kids. The dance hall (indoors) is adults only, but the activities on the boardwalk are definitely G rated. You never know what will be there--jugglers, magicians, various carnival type games, etc. It's a wholesome, fun atmosphere.
That said, I don't think it is worth a special trip. It is great when you are staying at Boardwalk or Beach club...I'd go past if I was there for dinner or maybe on the way home from EPCOT or MGM, but I wouldn't make much of an effort just to go for the boardwalk activities.