Your TA is wrong concerning why the Seattle cruises don't go north on the inside passage. It's just the straightest way to get to the Alaska towns. Coming back, you do the inside passage going into Victoria, B.C., then onto Seattle. It's much cheaper from the U.S. to fly into Seattle than Vancouver, and a lot less hassle. As far as the glaciers, we've been to Alaska 3 times and have visited most of the glaciers, including Glacier Nat'l Park, and are in awe of them all. What ever you decide, I'm sure you will love it.