You're welcome! I hope someone can chime in on the AP discount question. I've never booked more than one room at a time so I'm not completely sure.
Personally (and you didn't ask for my opinion, but I'll give it anyway

), I don't think the dining plan is that great of a deal - nor is it for everyone. We love to eat out at TS places when we go, but going so often and getting so much food is overkill. Plus I would feel so guilty if we skipped a TS one night because I just wanted a snack or couldn't get an ADR somewhere. That money would be wasted and I'd be so mad. But that's just me. I'm cheap sometimes.
I think you should compare the savings of the DP and DDE. The DDE accounts for a lot of savings and I think it covers alcohol, which the DP does not. That alone is good enough for me!