How Different is Dogs in the Vineyard from more “Traditional” RPGs?

Our gaming group has got a lot of experience in playing more mainstream/traditional RPGs; we’ve played D&D (3.0,3.5,4.0) World of Darkness, Rogue Trader, and even a little L5R. However, after the recent implosion of a WoD campaign, we’ve decided to try going for a more ‘rules light’ system, and we’re going to try out “Dogs in the Vineyard” (the rules at least; the setting itself is bothering some).

I understand that the game itself has a very different approach to things; what are some of the core ‘gotchas’ that we should be watching out for? Things that are so different that it’d never occur to us to check how we ‘should’ be doing it?