We had the aft balcony (starboard side) on the Island for the Cruisemates Get Lei'd cruise this past January. Our balcony was great while moving, but I believe it depends on what you are used to. Since the back of the ship does move more than the middle, we did feel it - but, hey! that's why we picked it. We used the balcony constantly. Harry Martin had the port side room and they had problems with unexpected noise (he can elaborate on that).
As to eating personal choice, I'm not sure I understand if you want to give up your traditional seating. The first night on our cruise, we were the only ones at our table and it was a SAD way to start the cruise for us. Luckily, that changed. I'm sure you'll get some expert advice on it, the only thing I can offer is to make sure your wait staff and tablemates know when you are eating elsewhere.