I've been on four cruises (1 other to Alaska in the early 90's) and have never experienced a cruiseship move as much as the Zaandam. I actually got seasick for the first time in my life (and I've been on much smaller boats in rough seas) on the Seattle to Juneau leg. I understand about 1/3 of the ship's passengers did too. Not only did the ship move from front to back and up and down, it also moved from side to side quite alot throughout the voyage. In addition, there was a constant vibrating rumble which went on almost every night all night long making it difficult to sleep. More consideration for the passengers should have been taken' especially on the leg on Saturday.
In addition, our stateroom (a Verandah Suite w/ balcony #6162) was not in the best of condition for what I consider a "premium" cabin. There were multiple stains on the carpet, chips in the furniture and the bathroom smelled like solid waste for most of the journey.
The common areas of the ship were clean and well maintained although the hallways and thoroughfares seemed to be a little too narrow for 1300 + people but overall the ship was in good condition. I was impressed with the lounges as they had qdequate comfortable seating with good views.