In my opinion the time of day that you go on some indoor rides affects the enjoyability of the ride. This is because of how your eyes adjust to the light/darkness. For example I find that Space Mountain is more enjoyable during the day. When you get in there you won't be able to see in the dark as well because your eyes haven't adjusted yet. This means that you won't be able to see the track while on you're on the ride, which I think is the biggest draw. The Haunted Mansion is best to ride at night. In there you want your eyes to be ajusted to the darkness because you will see things better. Of course if a ride has a long wait time your eyes might adjust while you're waiting anyways!