Teenager here!
I went to the Beach Club with my family in 2007 and I loved it! My sister (11 at the time) and I, (15 at the time) loved the sand bottom, "lazy river" aspect, beach area, water slides and the very convenient ice cream joint and pool bar area. Also, since we were within walking distance of Epcot and DHS, we were able to stay later at the parks knowing we were but 10 minutes away from home.
It was one of my favorite trips, and the pool was amazing!