My wife and I deliberated over this for a month. In the end, we decided that "cry it out" was really just gaming the infant's evolving worldview with a sense of "learned helplessness" - something both of us struggle with individually. So we knew it would be tougher on us - and it definitely was - but the alternative of teaching a baby that the only thing they could really do was "ineffective" was something we couldn't stomach.
At some point we all learn that we're helpless and we can't do shit to change the world... But we didn't want the baby to learn that from _us_.