Good morning, D!
I'll give you a few rambling thoughts about food and ADRs . . . when I am planning our WDW meals, one of the driving forces for me is to eat what I can't get at home. So, if you can get good German food where you live, do you also have access to a nice French restaurant? If not, I would go with Le Chefs. To me, table service dining at WDW is an experience as much as it is sustenance. We've eaten at Le Chefs a couple of times and it was wonderful, and also an experience - once Grace Ellen wanted to sub her entree's side item and the waiter said he would have to go check with the chef. We looked a little puzzled. He came back in a few moments and said no, the chef said no! I guess it wasn't "right" with the meat she ordered?

Fussy French chefs at their best.

Another time we had a GORGEOUS waiter whose name was Jacques or something and I could have just sat there and listened to him talk with that dreamy French accent, no food required.
Choosing restaurants is such a personal taste thing - everybody says Teppan Edo is not worth it if you have a hibachi restaurant near you, but we don't have a local hibachi restaurant since we live in the sticks, and love going there. Ditto The Garden Grill in the Land; we love it and think it's a great, relaxing meal. We are done with Chef Mickey's; we don't like buffets in general and the packed-in tables,

mediocre food, and chaos is not for us anymore since my kids are older.
Also, when I think about you going in August, you are NOT going to want a bunch of heavy meals in that heat. So I would limit myself to
one sit down meal a day, if you can. I remember one trip, just after Pop had opened and the dining plan was new and included appetizers and tips,

my kids BEGGED me to never again plan so many meals in one trip.
Random:
I don't think the dessert party is all that, and I'm a gigantic sweets person.
Great idea to ship water/gator ade. I would begin stalking the
Walmart website in hopes of scoring free shipping. We've done this in the past with great results.
Have you considered shipping a box of stuff (clothes, toiletries, etc.) to limit the amount of checked baggage?

It's not that hard to do. In fact, have you considered getting a Fedex account (and special pricing) for your bag business? That would make it so easy to ship stuff to WDW and back home. IIRC from my ex-husband's business, negotiated rates are about half the published rates for shipping.
If I think of anything else, I'll let you know.
