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timtyler comments on Probability Space & Aumann Agreement - Less Wrong
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How about Scott Aaronson:
http://www.scottaaronson.com/papers/agree-econ.pdf
He shows that you do not have to exchange very much information to come to agreement. Now maybe this does not address the question of the potential intractability of the deductions to reach agreement (the wannabe papers may do this) but I think it shows that it is not necessary to exchange all relevant information.
The bottom line for me is the flavor of the Aumann theorem: that there must be a reason why the other person is being so stubborn as not to be convinced by your own tenacity. I think this insight is the key to the whole conclusion and it is totally overlooked by most disagreers.
The reason is often that you regard your own perceptions and conclusion as trustworthy and in accordance with your own aims - whereas you don't have a very good reason to believe the other person is operating in your interests (rather than selfishly trying to manipulate you to serve their own interests). They may reason in much the same way.
Probably much the same circuitry continues to operate even in those very rare cases where two truth-seekers meet, and convince each other of their sincerity.