Why run back and forth? The 5 minute walk is about right depending upon the crowds, parades, shows. The rides all have long waits. The strategy for these is pretty straightforward. Get there at opening, ride TOT or R&R and fast pass the other. Get both done and then see the rest of the park. When you get to the back, get the fast pass for Toy Story and then do the other attractions in the area. Running around just gets you tired. You think you are saving time, but you are just running around. The key is to time shows and rides with your fastpass, not running to the far side of the park and back.