We went when my DD was 7 and she loved it. They have all kinds of flowered topiaries that look just like the characters. When we went back this year, she was very disappointed to see that they weren't a permanent feature of the park.
Also, don't forget the Kidscot stops in the World Showcase. We did this our last trip, and Epcot turned out to be our daughter's favorite place. On our last day, we were going to another "more exciting" park, but she insisted on going back to Epcot! Don't skip it, there is plenty for kids to see, do, and learn!