As someone coming from another state, and at this point, only going every couple of years or less, I feel like there is never enough time when we're there. Even though we usually spend 4-5 days in the parks, we always seem to be racing around to experience everything as much as we want, and we never seem to have enough time to browse shops for more than a couple of minutes at a quick pass, or experience much of the entertainment, or just relax!
So to me, the idea of being able to pre-plan all of it and avoid lines all together, is extremely appealing. If it afforded us the chance to be more leisurely in the park, and we had to worry less about what we'll miss out on if we take an hour to wait for and watch the fireworks, it would be awesome.
However, on the flipside, I recognize that I'm not exactly the norm. Not a lot of people would enjoy planning every last detail of their trip like that, and if standby wait times were gone all together, I think the lack of spontaneity would ruin it for a lot of people. Especially given that DL attendance is so AP driven. Even I would miss being able to ride Splash Mountain 3 times in a row in the morning when the standby line is 5 minutes because no one wants to get wet that early in the morning. Or deciding to take that one last trip on Pirates on our last night to say goodbye.