First off, you'll love Davy Crockett. we#ve been three times now, and Love it. From Car parks to Disney parks. it's about a min walk, not long, and there are travelators if you end up towards the back of the car park. Stars n cars is in the Disney studios, whereas café mickey is in the village, to be safe I'd reckon on 10 minutes to get from one place to the other, and then you need some time to find a spot.
As for the pause gourmande(sp?) as far as I understand you get a voucher for each day that you're there, but I don't think they're dated, and can be used at any time, much like the meal voucher. I'd ask when you get given them to be safe, unless someone else knows for sure?
You're going before us, so please let us know how you get on the the afternoon treat voucher - I'm eager to know what exactly you can get with it!