If comparing theme pools our experience has been that CSR was the least crowded. It is larger, has more to do around it, and because it is a convention hotel, maybe your ratio of guests using it is less.
POFQ never looked crowded when we visited. Am thinking that it is a smaller resort and maybe the pool is large in comparison to number of rooms.
POR we always enjoyed and never had a negative experience with crowds. But we never swam when it wasn't busy.
CBR the theme pool is way too small for a resort that size. We were there in off season and the overall experience was too tight during the daytime.
We have never had more than a few folks in the quiet pools with us at any of the moderates.