it sounds like Harv and Marv get up close to the whales. We did the official Disney listed whale watching excursion, and the boat very deliberately would not get within 50 yards or so, saying that it didn't want to disturb the whales or scare them off.
Thus, all we got was a lot of sedentary sitting in the boat, and some quick glimpses of distant whales. I was kind of underwhelmed by it all. Mind you, the boat is quite comfy, kind of a big room with cushioned pews, large windows, binoculars provided.
If you have binoculars, you could probably see some from the ship.