My 18 year old daughter and I just got back from our cruise on the Allure of the Seas.
The ship is big, but it never felt overwhelming to us. We loved all the interactive signs to help you get around easily. There was always something going on and we had fun exploring the many things there were to do. We only felt the ship move once the whole week. I'm not sure if this is because of the ship, or the conditions of the water, or both, but no sea sickness at all. It felt like we were on land the whole time.
Embarkation/Disembarkation: Couldn't have been any smoother. I was nervous, not knowing what to expect, but it was smooth sailing. No waiting... no line ups. We also brought our own lanyards, and had guest services punch a hole in our sea pass cards. This made life much easier on the ship. Wearing the card around your neck made it easier to access it and also not lose it.
Fairly good size room with plenty of spots to store clothing and toiletries. A little noisy at times from all the activity on the boardwalk. But things wind down by 11 pm in this area, so no problem sleeping. I thought we would be bothered being so close to Dazzles. We never heard a sound from that venue ever. We would stay in this room again.