We stayed at the Aladdin at Christmas time. I asked for an upgrade at check in and was preparing to use the "$20 trick" but it was not necessary. We were upgraded (2 rooms) to the resort rooms for no additional charge.
Although our check in line was quite long, we had no problems.
Its a beautiful hotel but I prefer to be around the Flamingo, Bally's, Harrah's area.
Enjoy, Tom