I was like you and trying to decide. I do think that it is worth it. Here is why I figured it would work for us. To start with we are going twice this year at least that is the plan and that alone will save us $250!

(9 day hopper and then a 5 day hopper vs. AP)
The discount on a hotel is a big bonus. It is no 40% pin to stay where you like but still gives you a savings. I like you, try to post and research to get my answer and the research proved more useful. I remember last year for around the time we were looking at going there was a savings of about $90 dollars a night for AKL and WL. It seemed to be less for the other deluxes and even more less for the other hotels. I would like more freedom to choose where we stay but the larger discount will dictate that. LOL
To me the other big bonus is the DDE card. Sure it is $60 but will definatly save us some money over the long haul. We should break even at the midway point of our first trip and the rest is just savings. We have always gone during
free dining. My DH was tired of all the TS and wanted a less structured vaca?? Not sure how that is going to go but at least we will have the DDE to save. I booked TS rest and this way we will still have a back up. (yes I will cancel if we decide not to go)
So look at your type of trips and do the math. I do think it might be the hidden way to save extra money. Lets hope!