I guess what I mean is that having a tag like "nigh invincible" or "immortal" or a move like "shed skin and regain all health" force the players into that all-too-familiar old-school stance of "well shit, we can't just rush in and bang away at it" because those moves and tags tell the GM that a mere sword or bow just won't trigger Hack and Slash.

That made a few things click for me.  I'd still been subconsciously treating moves as things the players chose to do, rather than rules that kick in when appropriate (even though the rules clearly state that). 

That was enhanced for me by having trouble getting one of my players to say what they were doing, rather than simply calling out moves.

Okay, so after running a game wrong, and reading some forum posts, I think I might get the way DW is supposed to work.  I want to recap my thoughts here to get some feedback.

I now understand that monster moves happen when players roll badly enough on a player character move.  But what was getting me, though, was what happens if the player characters never make a move?  Just standing there while a grizzly bear charges, them, for example. 

I worked through that to come to my basic statement of DW philosophy, which I hope is right:  Player character moves are the player's way to alter the course of the narration. 

So if they do nothing, I continue narrating how the bear mauls them, and have them take damage.  If they want to avoid that, they need to make a move of some sort. 

Is that how it's intended to be run?