While that may be true for actual restaurants, that is NOT the case for WDW. QS areas also act as cooling off or rest stations for families with small children and the elderly. If I were to bring my elderly grandmother, where would I have her rest and cool off from the heat other than in the general seating areas of QS restaurants? There are not that many benches, and most air conditioned areas are either lines/rides or merchandise. I would hope someone that is using the QS area to relax would be willing to share with someone looking to eat, but I don't think they necessarily need to move for you or have to share a table with your family either. To say if you are not eating in these areas, then you are not using what the area is FOR is just an incorrect assumption. If WDW wants these areas to be used exclusively for eating then supervision is needed and it needs to be made explicit to the guests as currently there are no signs stating otherwise. They have started to have CMs monitor areas for eating but this is only during peak times, and this is when I think you can assume you may sit with another family or a person holding a seat as it would be directly against WDWs intentions, but if it is not explicitly stated to the guests I would strongly disagree with you and you should wait your turn like the other families did for a table.