Yeah it sucks my battery dry as well and that's regardless of which wifi I use. It's actually because there's basically a digital traffic jam going on. It does the same thing to me when I'm at Steelers games as well.
I honestly never have any problem at any of the DVC resorts. I watch Netflix on my laptop and youtube and everything. My main problem with wifi is in the parks because there's just so many people trying to also get a signal.