As I have gotten older, I sit on about 98% of my stands. If the spot forces me to stand such as the grass is too tall, or I won't be able to see the coyotes because of the lay of the land, I will stand. I don't sit on a swivel seat as I walk too much and carry too much crap, so have a light beard buster chair that saves my back, and keeps my butt off the cold ground and only is about 1lb. If a coyote comes in from a side or rear position, the gun is connected via acra swiss to the ball head, so I grab one leg, and lift the gun and do a quick reposition to get in the general direction of the coyote and then the minor adjustments the tripod and gun allow for. On rare occasions if a coyote is moving really fast, I may have to adjust a 2nd time but rarely.
When I was younger I laid prone, especially during the day. Now that is too hard on my back and is so limiting as far as seeing coyotes coming from different directions. For the guys that stand, I totally get it and realize the reasons for it but it isn't something I plan to ever make a habit of.