I wear my harness at all times. On the range, in the stand and while in the hills. Even when I'm scouting I have it on. The only times it's a pain for me is when I wear my seatbelt in the truck or SXS.
Yes, I wear mine in the stand. Started using it a couple of years ago and have had no issues. I practiced extensively shooting my bow with it on in the yard to make sure there are no contact issues. It's been surprisingly incident free.
Every time I leave it behind I end up regretting it, so it just comes with me on every hunt now. I wish something existed that was a hybrid between a bino harness and a split chest rig to make it easier to zip and unzip layers while it's on.