Mine never do, I don’t think that they’re programmed to. It’s probably for the best, given that in Zoo Tycoon 2 alllll of my seats were taken up by staff.
I try to make a central back of house area for every exhibit or two/three, depending on how close together they are. Then my guest paths are away from that area, so there’s no interference. It’s expensive, but I think it works most efficiently long term.