I used to feel the same way about 1 day vs 2
but the deal is you have all this stuff set up already, so all you really need to do is book the bands
and then what you might consider filler, is somebody else's reason they're going...and, as you can see from the forum here, you never which band people are going to love or hate...so, if you're like me and want to please everyone and feel their undying love, you need the large canvas to paint your masterpiece
plus, as I said before, this gives us the time to stagger the sets so everyone could see every band if they wanted
if there happens to be an hour where there's nobody playing you want to see, then that's when you can explore the other stuff, or use the opportunity to make that new concert-mate friend that's been missing in your life...it's easy...just turn to your neighbor, give them a hug, and say something like "that Seth sure books the best festivals..I am coming here every year no matter what they say on the Forum!"