If you're going to be riding with small children then Dumbo first and then the other Fantasyland rides like Peter Pan, Mr Toad & Snow White. The other long lines have fast pass. If you plan on skipping the Fantasyland rides, Indiana Jones, PotC, Big Thunder and Haunted Mansion are all located close together and will have longer lines as the day gets later.
In DCA Soarin is the most popular ride near the front gate. There are a couple of rides on Paradise Pier that can have long lines, but it depends what kind of roller coasters you like if that is an issue.