So I'm a skinny guy so this doesn't really affect me but I started to notice at the end of last year that the belt didn't have much room left after buckling for me. My gut has started to grow so I chalked it up to that (desk job with readily available Little Debbie snacks will do that to ya). I have ridden Millennium twice this year and both times the belt seemed to be in the same place as the end of last year. I did however notice that the trains got new seatbelts (the same type, just new) and maybe since they are brand new they don't have as much give in them as belts with a season's worth of use in them.
Ops have been horrendous on Millennium. Horrendous. But I didn't see any walks of shame, just maybe a little extra help from the ops on a couple guests per train. I think a lot of the horrendous ops have just been new season new ops, which happens every year.