As someone who has only recently (finally) become disillusioned by OO (especially in larger codebases and/or on programming teams, which both seem to rapidly escalate tech debt and complexity thanks to things like mutability, class reopening and stowing-state-everywhere)... I'm so sorry, man. The difference (which is significant) unfortunately seems to require years of real-world experience with both to see it.

I've been pointing OO people to these thoughts by John Carmack, who is pretty well-respected in the C++ OO community: http://gamasutra.com/view/news/169296/Indepth_Functional_pro...