Well, Mexico has an established queue for its boat ride when it gets long. The main problem s actually the new margarita bar they're building on the side of the pavilion as that's where the extreme overflow was supposed to go. They jack up and move some of the inside kiosks to shift the interior layout a little, then do the switchbacks around the restaurant, then down the side, switchbacks in the gallery space and then out the west side of the gallery, switchbacks on the raised platform, then down the front steps and to the west where that new margarita bar is located.
So in theory no issue unless it's hugely popular.
Now.. Ratatouille..
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It pretty much has no interior queue. There's on scene with an animated Gusteau marquee that all three queues can see (standby, singles, fp) and otherwise it's all outdoors in the heat.
I think that's why in the Epcot concept art the entrance is not on the far right corner of the building but rather more centered - more space to the side to build some queue. I uspect singles will go away as it serves no real purpose considering the layout of the ride vehicles.