Couldn't agree more, the walk from the Dolphin Show to Shamu would be very similar of Splash Mountain to Buzz Lightyear, not insurmountable, but not something you want to do too often and unnecessarily. The website does not do a great job of show times well in advance, but they may be up or should be soon. Know the park map and show times - about 10-15 minutes of planning and you will be ready.
On a shorter off season day, the crowds will be very manageable, but just not enough time to do "everything," so prioritize. I have an 8 year old (they are not all alike), and she loves Shamu's Happy Harbor for some play time, but only when we have 2 days to visit. It is either a blessed rest for parents as the children play, or a time waste if you are missing other more worthwhile attractions. My family loves the whole park, but I would put the Sharks, Turtle Trek, and Kraken on that list as well. We have seen similar shark tunnels at zoos and aquariums and we are an hour or so from a major roller coaster theme park, so that is what works for us. For some reason, I am the only one who likes Turtle Trek in my family...