Just to add to the others, we were on the same cruise and both came home with covid. My wife started getting symptoms on the last sea day and I started on disembarkation day. She took a test when the symptoms started, but was initially negative. We both tested positive the next day after arriving home. We both have mild, but persistent symptoms.
To answer the previous question on dining wait times - No. The first day there was a bit of a queue to get into the main dining room. We had a group of 6 and had anytime dining. We typically ate around 630 and had the same team with us the entire cruise. Service was fantastic throughout the cruise. If there was a staffing shortage, it wasn't obvious to us.
All said, we don't regret the trip at all. This was our first Alaska cruise. We had an amazing time and saw things we'd never see before. We are already planning our next cruise.