We've stayed Deluxe several times and haven't been back to a Value nor a Moderate yet.
We usually spend part of the day in the parks, go back to the room to rest, go back out to a park and then back to the room. We spend a bit of time at the resort so the extras mean something to us.
The Deluxes are a much better experience, there is more to do, the pools are usually better, you enter the room from the inside and you have a balcony.
I wouldn't have a problem going back to a Moderate, but wouldn't want to go back to Value. Our experience with Value was that they were a little too loud, and the rooms a little too small.
All that said, I wouldn't pay rack rate for a Deluxe, it is too much money. But with a discount I would always wants to stay at a Deluxes.
Just don't stay at a DVC room, you get a full kitchen, multiple rooms, and hot tubs. That will spoil you.
