We stayed in Royal Pacific last Saturday with 2 adults and 3 kids (14,12 &12). I would guess its about the same size as the riverside rooms with the rollaways in POR, but my memory may not be entirely reliable as it been a couple of years since we stayed at POR.
The room with 2 queens has a very small gap from the wash basin wall to the bed, usual 2-3 feet between the other queen bed and then not much space between rollaway and windows.
We found it to be a very nice hotel and would certainly stay again. For us it is fine for a day to two but if we were staying a week would probably want a bit more space. The express passes were definately a great benefit of staying onsite.