I found they are a must if you stand up and use a foot controlled trolling motor that doesn't have a pedal well. Trying to maintain balance in rough water, while casting, while operating the trolling motor, all on one foot isn't easy, and the seat keeps you from falling over. However, if you sink your pedal in so it is deck height, you can balance with both legs, yet still steer just fine. In that case, I found the pedestal to be getting in my way, seeing as I wasn't leaning on it at all. I would just turn around to get to a hatch and run into it. I sold my butt seat and post, which I bought brand new for the Yazoo, and used maybe 4 trips, last Sunday.
I think it helps with balance, and not much else. Didn't do much for taking a load off your legs. I fish standing up until either my left leg/ankle starts to give out, or my back starts to hurt, then it is up to the regular seat on a short pole.