TheCosmicKid
Hero
I use the multiplier and I don't use the guidelines. If there are twenty orcs charging the party, it's because it makes sense in the narrative for there to be twenty orcs charging the party -- whether the party can handle twenty orcs in a fight is their problem. But if they do handle it, I think they deserve a bigger reward than if they killed twenty orcs over the course of twenty fights.Using the multiplier would also force DMs to use the Encounter Guidelines.
Metagaming to maximize XP would be a foreign concept at our table. Just not how we approach this game. Even if it crossed my players' minds, they're acutely aware that their characters can die, and accordingly approach combat with all caution. Dead characters receive zero XP, of course, so kiting all the monsters into one big fight would be considered a colossally stupid idea. And, hey, if they did decide to do it anyway for strategic in-character reasons ("We need to concentrate the orcs and break them in a decisive battle!") and manage to pull it off, then sure, they deserve multiplied XP for that, because that's pretty cool.