I know your pain Chris. I had a total knee replacement back in 2004. I was away from the tractor for about three weeks. I got so desperate that I found a way to hop up on the New Holland TC40DA using the combination of crutches and one good leg. I actually got pretty good at it. Getting down off the tractor was risky though. Looking back, I'm amazed that I didn't plow head first onto the concrete floor.
But, it was a sign that things were returning to normal. Just a short trip around the driveway brought back the will to live. Rehabbing the knee while watching tv all day when all that is advertised are laxatives, diabetic testing supplies, mobility scooters and your final arrangements gets mighty depressing.
So yes, one can experience tractor withdrawal.