We did this last summer while staying at VWL. I will have to say that we were asked for our IDs at the pool. I went to pick up some towels and was not given any until I showed my room key. I noticed that all people were asked for IDs when getting towels, not just us.
We had a great time doing this. We set aside an entire day to pool hop. We were also asked for ID at SAB and given a wrist band. (This was before no pool hopping at SAB) Boardwalk did not ask for IDs, but it was getting ready to storm and only a handful of people were by the pool.
Karen