I have to agree on Blizzard Beach - my 4 year old love the fact that she could go on mini versions of proper slides, it made her feel very grown up! As she got more confident, she progressed to the slides in the teen area (called something like Ski Patrol?), and she did great on those - I went down at the same time as her, to watch her, and ended up upside down swallowing a gallon of water, by the time I had surfaced and stopped choking, she was standing on the steps of the pool waiting for me... I guess I wasn't needed at that point!
At Typhoon Lagoon there are lots of things that spray water at face level, and she really hated that.
We also preferred the family raft ride at BB, we all went on that, including my 4year old and we thought it was a blast - the equivalent ride at TL was very short and quite disappointing.
Bev