This was our 3rd cruise to Alaska (first 10 years ago with Celebrity, and second 4 years ago with Holland, both Inside Passage). We decided for this one as a way to visit Denali.
The good things:
A) Celebrity did a major refurbishment of the Millennium. And it is not just some makeup: the ship got a major rejuvenation rework (we travelled in the Infinity a few months ago and the differences are remarkable).