I've had a BSSO+LeFort I before with another surgeon that didn't went well so my chin was still a bit numb from that. I feel like the additional numbness from the chin wing is already gone. Also, a bit of numbness is really not a big deal - nothing you ever notice in your daily life.
Yes, I had a bone graft, but in most cases it's not needed anymore today. I had a big gap in my bone on one side from the last surgery that made it impossible to do a continuous cut without damaging the nerve, so he had to cut around it and took the bone graft to try to fill it up. So far that seems to work, but there's a danger of bone resorption. But this is not something normal cases need.
Like any lower jaw surgery, swelling is biggest after 3-6 days, then goes down. I was back at work after 8 days and I don't think the swelling was noticeable anymore... but I also didn't care too much.