What sticks out in my mind was an interaction with one of the new players as we were moving forward through the dungeon.
Player: I'm in the back watching for anything coming up behind us.
Me: Ok, no problem, the party begins...
Player: No, hang on. I'm looking EVERYWHERE behind us. I'm looking up, I'm looking left and right, I'm looking down...
Me: Yes, yes. I got it, you're on guard behind us.
Player: I want to be absolutely clear what I'm doing. I'm actually turning my body around every few steps to make sure that I'm looking behind us.
This went on for long enough that it stuck out in my mind. Here is EXACTLY what I was talking about. Players who have been trained by DM's who think that challenge=Mother May I and Calvinball. I actually stopped the game at that point and explained that they really, really didn't have to do any of this. I will never intentionally screw over the party like that. ((Granted, in the next freaking scene I forgot about the damn wizard's flying familiar keeping watch above when the meanlocks dive bombed the party -

Damn)) But, mistakes aside, I don't ever do this kind of stuff. You will never, ever hear me ask, "So, how are you checking for traps?" "How are you searching the room?" That kind of stuff is just something I will not do anymore.
So, when people talk about that being a big part of the exploration pillar, it just totally turns me off from the whole idea.