The Answer to your question is absolutely not! You will not have any trouble getting back to your resort after you eat, when the park closes and everyone files out, Disney Will keep at least 2, sometimes more buses right at the start of the bus drops, right at the 1st directive sign, just for people leaving Rain forest, they will but on people going to all different resorts and take them where they need to go, sometimes, you may have to visit a couple thats not yours, but they will get you back to WL, We have walked out and been the only ones on the bus and they ran us back to Pop, just this past november, so make your Res, and have fun with no worry of how we I get back.
TRUST ME