My whole family are early birds, my wife hates it haha. If we ride later into the day it's no big deal, but usually the old guys are tired by early afternoon anyway.
The stress comes from the hoardes of people moving to Bozeman that have no common courtesy. There never used to be issues, but now it's not uncommon to come back to your truck and have 3 or 4 vehicles blocking you from getting out of the parking lot. The biggest lot we go to can have around 100 rigs in it sometimes, it's insanity. Being early at least gets you a spot with a straight shot to the highway.