I like the shows that pop up. Although many are scheduled, we don't usually plan our days around them and rely on dumb luck to run into one. On our trip a couple weeks ago, we ran into the Vikings in Norway, the balancing act in France, the French Canadian band in Canada (All WS/EPCOT), two musicians in Africa, and the Carnivale party (AK), The Muppets, Dance Party, and Big Stage show (in MK). If you have strict schedule to beat the lines, get to your FP+ deadlines, etc... then you can miss out on the fun of just stopping to enjoy things that fall in your lap.
We were staying at the AKL so we could enjoy down time watching the animals on the savannah. Even if you are not a guest, you can stop in to walk around. It is an amazing thing to see. Sit by the fireplace with a drink, talk to the animal expert at the savannah overlook, etc..