Noise will mainly be determined by guests staying near/above you. I've had perfectly quiet rooms on 1st floor and crazy noisy ones on the 4th floor when guests beside us thought 2am was a great time to party. Any room can be quiet or loud so unfortunately location doesn't always matter. If you would prefer 1st floor due to
scooter I'd request that.
That being said, we were on the 2nd floor last year and both my parents had scooters. We never waited more than 2 or 3 minutes and depending on how many people were already in the elevator, we sometimes needed to wait for 2 elevators. We never waited anywhere's close to 10-15 minutes!! Sorry this happened to you in the past!
Yes, the construction at the rear of Classic Hall towards the 50's section is the Resort Airline Check-in area refurbishment.