Maybe someday somebody will be able to explain to me how making 3 FP+ reservations equates to "scheduling every minute of the day".
If I make 3 reservations for attractions at, say, DHS with return times from 5-6, 6-7, and 7-8 PM, all that does is tell me that, if I decide to go to DHS that evening, I will have the opportunity to enjoy those 3 attractions in a space of 3 hours. If I decide to do something else that evening, it hasn't cost me anything out of pocket. At worst, I lost an opportunity to get a FP for something else at some other time of the day. And, even if I choose to use those FP+ reservations, I am still free to do whatever I want for the majority of the day.
Would you say that you've scheduled every minute of your day if you buy tickets in advance for a sporting event, concert, or other show? Those things require much more of a specific time and financial commitment.
If I don't want to commit in advance to buying tickets, I can wait until the last minute and take my chances that I might miss out on something I want to do. I see FPs the same way. If getting a ride on Soarin or TSMM is critical to your enjoyment of your trip, FP+ gives you a chance to make a reservation for it in advance. If spontaneity is more important to you, don't make reservations, or feel free to dump the ones you've made if you don't feel like using them. After a couple of trips in which we entered the parks using CM Main Gate passes, and couldn't get FPs in advance, I know that you can still enjoy a lot of attractions, and have a lot of fun, while starting the day with a clean slate and just using FPs that are available same day. On those trips, we have always been able to do every one of the major attractions in all four of the parks in just 4 park days.