My sister and brother-in-law and their young kids live in a section in Mt Laurel just off of Church Rd. The streets are "horse-related" like "Paddock" "Harness" "Colts Gait" and "Barn."
The houses are big, and relatively new, but with smallish yards. Very kid-friendly neighborhood. She and all her neighbors have young kids and there are always neighborhood parties for kids and families. Hardly any traffic, so they can even play in the street.
Here's the neighborhood on mapquest:
Map of Mount Laurel, NJ by MapQuest
Hope it shows you the right area.
The only thing I don't like about the neighborhood is that the yards don't have any big trees, like many newer developments.
The preschool they go to is supposedly really great, and there are plenty of shopping centers and restaurants nearby.
When I was younger the area was all farms.