I agree - I was just at Tl this past Thursday and it does have more to offer smaller kids. The lazy river is just that - float along and cool off without expending a whole lot of energy.
We did BB last year and had fun as well - but definitely more intense slides.
Surprisingly, my 12 year old son commented as we were leaving TL Thursday that he liked it better than BB. There were more slides at TL where you use rafts than at BB, he liked the rafts. And I recall when we were at BB, he didn't seem to have a great day so am not sure what that was about.