The disney website under things to see and do for Alaska cruises says:
"Sawyer Glaciers
At the end of the fjord lays the translucent mountain masterpiece known as the Sawyer Glaciers, comprised of the North Sawyer and South Sawyer glaciers. These age-old massive ices sheets have a light-blue glow to them. The South Sawyer glacier alone stretches 1/3 of a mile and is a wonder to behold.
These glaciers offer a glimpse into a time so very long ago, when huge chunks of ice the size of continents swallowed up whole countries during the Ice Ages of the past. Once an hour, on average, slabs of these great glaciers calve and tumble into the saltwater below."
Sounds to me like they cruise all they way up to Sawyers glacier. If they don’t I would book with another line as that is one the of the main reason to me for doing an Alaska cruise.