It’s really not that bad - at least not for my family. We would be much more disappointed if we missed experiences that we looked forward to, and we love the freedom of spending the day at Blizzard Beach, getting to AK around 4, riding FOP, Safari and Everest with a stop in between for dinner at Tiffins. It’s really not that much planning.
I’m sure that people who hate reserving rides and find themselves suffering at the parks are letting Disney know. Disney is probably hearing from them as well as from those who appreciate the system.