There's something about being in a place like that that puts you (or at least me) in a state of heightened awareness. Almost like a low level of adrenaline. The stakes are just much higher than other back countries I've been in. In the Tetons you might listen for bears at night, or in the cascades I watch my step carefully and pay attention not to get lost. When I whitewater kayak you focus on the river closely but when out in the open desert like that it's a prolonged sense of stakes and foreboding. Constantly tracking your water intake and whether you're overheating, watching for shady spots in case you bust a tire or roll an ankle. The realization that if something goes wrong it's going to be hours and there's no nice wood to make a fire or stream to bunker down next to adds an isolating but freeing sense of consequences to the experience.