I avoided waterparks since they opened (never even went to River Country) because I thought of them as "kiddie places." My wife talked me into TL last September, and this Disney Veteren is hooked. Old dogs can learn new tricks.
It IS hard to do the place justice with descriptions. I liked the fact there were trees everywhere (I burn easy). DW liked the fact there was also sun everywhere (she tans easy). DW liked the wave pool, where you either get slow, steady waves, or a big six foot wave every 90 seconds (they change the pattern every hour). I liked the "lazy river." I guess it is just floating around on a tube, but that hardly captures the feeling. It circles the park, going through the various areas. Instead of walking places, you simply dive in, grab a tube, and float to your destination. Along the way, you're serenaded by early 60's beach music (Beach Boys, Jan and Dean, Delltones, good stuff), you pass through a rainforest, and you go through a cave with waterfalls as you pass under Mt. Tilly. There are raft runs, water slides, and a kiddie area (can't tell you much about that, I didn't qualify).
In the end, my wife loved it because she got a heck of a workout in the wave pool and a heck of a tan on the beach, and loved doing both. I loved it because after a night at PI, lazing around that river listening to fine classic beach music was, for me, a "disney moment." The "rides," per se, were adaquat. Don't forget the snorkling pool, where you swim and snorkle through a tank of exotic fish and safe sharks. I think it's over-rated, but kids seemed to like it.
To paraphrase tbear, just go! It's great. And that's from someone who for several years didn't want to "blow thirty bucks on another Disney money vacuum."
Pat