Possibly, but I think it's easier to get this with other rationalists than groups of other epistemologies. Several differences:
Other ways of thinking produce different conclusions with the same information, e.g. 2 people think the same way, but one's a Christian and one's a Muslim. So there isn't the benefit of Aumann agreement.
There are objective standards that all parties know everyone agrees on without prior discussion. Deviations from these can be noticed.
Rational people change their minds occasionally, which makes any discussion more pleasurable.
There are many pleasant benefits of improved rationality:
I'd like to mention two other benefits of rationality that arise when working with other rationalists, which I've noticed since moving to Berkeley to work with Singularity Institute (first as an intern, then as a staff member).
The first is the comfort of knowing that people you work with agree on literally hundreds of norms and values relevant to decision-making: the laws of logic and probability theory, the recommendations of cognitive science for judgment and decision-making, the values of broad consequentialism and x-risk reduction, etc. When I walk into a decision-making meeting with Eliezer Yudkowsky or Anna Salamon or Louie Helm, I notice I'm more relaxed than when I walk into a meeting with most people. I know that we're operating on Crocker's rules, that we all want to make the decisions that will most reduce existential risk, and that we agree on how we should go about making such a decision.
The second pleasure, related to the first, is the extremely common result of reaching Aumann agreement after initially disagreeing. Having worked closely with Anna on both the rationality minicamp and a forthcoming article on intelligence explosion, we've had many opportunities to Aumann on things. We start by disagreeing on X. Then we reduce knowledge asymmetry about X. Then we share additional arguments for multiple potential conclusions about X. Then we both update from our initial impressions, also taking into account the other's updated opinion. In the end, we almost always agree on a final judgment or decision about X. And it's not that we agree to disagree and just move forward with one of our judgments. We actually both agree on what the most probably correct judgment is. I've had this experience literally hundreds of times with Anna alone.
Being more rational is a pleasure. Being rational in the company of other rationalists is even better. Forget not the good news of situationist psychology.