I can attest to that, though I think I've gotten pretty good at telling when one is about to jet off in a different direction.
I do "herd" mine each afternoon, walking behind them and waving a pooper scooper to direct them where to go, but I'm curious as to how many chickens becomes too many to manage in such a way.
I have tried to herd them with sticks and the like but while I can get them to move in a general direction, I never have had any luck trying to get them to do any precision maneuvering, like through a coop door. Several always end up breaking back and by the time I get them rounded up, the others have escaped wherever it is I'm trying to get them to go. More people would probably help, but my 8 year old son doesn't quite get the concept of not chasing or circling and slow, predictable movements. His chaos (and very predatory actions) leads to the animals responding in kind. Hes young yet and gets excited.
One thing I have noticed is that, when pressured, chickens don't seem to be inclined to move as a group. I suppose if a fox were to suddenly appear, the sudden dispersal of prey in any and all directions would lead to his confusion and the chances of survival for any one bird would be increased.
This is unlike moving herds of cattle or buffalo, or flocks of ducks where they tend to move together. Some may break back but most often they want to stick together and follow the other animals. This makes it possible to drive them from pasture to pasture, through gates, and corrals, into trailers, coops, runs, etc. Their response to pressure is generally a known factor and we can use this to our advantage to make our idea of what we want them to do become
their idea. How to do that with a flock of 30 chickens who's response to pressure is disperse in all directions is something that has so far eluded me.
(I see that Folly beat me to punch here, and in a much more concise way

).