I did the Vancouver to Hawaii Spirit sailing in Sept 2005 and found the 5 days at sea to be more enjoyable and less hectic than the 7 days in port. It was sort of like a 5 day relaxing resort vacation followed by a very port intensive 7 day cruise - I would do it again in a heartbeat!
My wife & I found 5 days at sea just about 3 days too long. We sailed on the Spirit (WHAT A CREW!!!) from Honolulu April 28. We sailed around the islands for 7 days, and then cruised onto Vancouver for 5 days. Finished that journey on May 10. We reboarded for a 7 day round-trip cruise to Glacier Bay, AL & back to Vancouver.
But the 1st 2 days at sea from Hawaii were mildly rough with 10 ft seas. It eventually calmed down the closer to Vancouver we got.