OKW has a really great Playground area.
With smaller children, it's nice to have somewhere for them to play for a little downtime. I always took my Ds's out for a swing and a slide before nap time while at WDW. Swim would help them relax too.
We did not like the Playground/BBQ area at WL either. We stay for long stretches of time, so we really enjoy the resort amenities and often chose our resorts based on downtime not park time.
For us, we liked SSR the best as far as playgrounds go, because of the soft play surface, no sand to deal with after, and from the pics you can see that it is gorgeous. That is the Congress Park play area in the pic and the BBQ Pavilion is right next to it. Awesome DTD view from there.
SSR has similar play areas in several sections.
For our family, it was nice to have play areas, where the kids could play that was not crowded like the park areas. The parks can be pretty confining for a little one that likes to run and play. Also as a parent, I enjoy every moment my kids are having fun, no matter what we are doing.