It would be great if no one had to make ADRs and you could just walk up to the restaurant of your choice. But if you think of the logistics of hundreds (thousands?) of people walking up to a popular TS restaurant at dinner time and expecting to be seated, you have to agree that ADRs are very necessary!
That said, I like planning my ADRs. It forces me to make a "game plan" of what parks we are doing which day, how our park schedule will work with our ADR times, etc.