I'm with ya. It took a few years to really hone my processing process. But, now, I can take a deer from hanging off the back of my truck to my freezer in about an hour and a half.
I still hate cleaning up the mess though. That actually takes longer than butchering the whole darn thing.
It all starts with a knife that will hold its edge throughout the whole process. So I make my own knives too. I have taken three deer from field to freezer with two knives and never sharpened once in between.
They will need a good sharpening after three though. I think I could force em to go four deer, but that is pushing it and then your butchering times start increasing.
Nick