If you're looking for rides, miniature golf, skee-ball, etc. then Wildwood is still a very good place, as are Seaside Heights and Ocean City. Wildwood is pretty trashy, but if you like that sort of thing, it is for you. (I was born and raised on the Jersey shore, so I personally embrace the trashiness!) Ocean City is much more family-oriented, and Seaside is sort of in the middle.
There are other places that are "family-friendly" in a different way, that is, sober, quiet and without the rides and bars. Places like Avalon and Spring Lake fit this description.
In Delaware, Rehoboth Beach is on the louder side, Bethany/Lewes are more quiet, and Dewey Beach is, shall we say, not the best place to bring small kids as it has a vibe of of Animal House on the Atlantic.
In Maryland, Ocean City (yes, another Ocean City) is full of rides and skee-ball. It is just over the state line from Delaware.
I too would stay far away from Florida in the summer. Yuck.