Agreed. Private methods/variables should have no reason to be called outside a class. If necessary, simply make a public accessor that calls that private method/variable.
I personally use underscores because it is helpful from a visual standpoint. Especially when there are no built-in security measures in place to hide variables and methods (not include closures, but that's not what I'd consider a "built-in" way to hide things, no offense to closures, of course).
Even still, coming from Java, I used them there. You simply get used to it, and while I agree it is not the prettiest thing in the world, I've seen worse :)
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