Agitation is especially good on Trapper and Hag

Hag and Trapper are trap setting killers (obviously), and they have to play defensively. They not only play defensively, but they also are very territorial. As Trapper, you want to pick a part of the map and stick to it, same for hag but this applies to Trapper more.

The Trapper has bear traps that will pin down a survivor and if you can get there before they escape on their first attempt, that is a down and a free hook. However, the Trapper is much more territorial than the Hag. He has to stay in his den of traps (which you should be placing) and rarely leave. If he does leave, a survivor could step in one of his traps and escape if he strays too far. The survivors can also disable your traps and not be punished if you aren't close enough. This is why you have to pick the right spot with your traps.

Hag has traps she can teleport to and hit survivors with. Her base range to teleport to them is 40 meters. So she can pick a spot of the map, set up her traps, and much more effectively control them because if a survivor triggers one, that is a hit.

But here is where agitation comes in. If survivors try to make you leave your area which they will try to do, you can down them and bring them back to your den much more effectively and easily since you can travel much further with it. Make sure you use the level three version, level one and two of agitation are pretty bad. Anyway, with agitation, you can keep survivors in your little area of the map you set up traps in because you go so much faster with it. You can also contest survivors trying to take protection hits. Overall, it is a really good perk on these two killers especially because you can keep people in your den. I would recommend running it if you are good at playing these two killers and have a reserved sort of playstyle.