It can be a game changer. Like Lifesaver and other kooky situational skills that don't rack up the body count but when they kick in can make a big difference.
Distributor. Instead of putting the spawn cards down as the game would normally direct, the person with the skills takes them, looks at them, and chooses where each card goes.
It can impact how the game would pan out in a few ways. The most common our group has run into is when the cards would include an extra activation.
Say you've four spawn cards to put down,
#1: Two Walkers,
#1 Walker on a manhole,
#3 Nothing,
#4 All Walkers get an extra activation.
If that extra activation was put down before the walkers then they wouldn't be getting an extra activation, only those already on the board. If there was a survivor on a manhole and got walker placed next to him, whether they got an extra activation placed before or after could mean the difference between the survivor getting wounded or not.
If there's an area that's already heavy with zombies it could be useful to allocate the #3 Nothing card to the nearest spawn point to take some pressure off. Or if a survivor is laden with skills and weapons and ready to kill next to a spawn point, the two walkers could go there. safely knowing that survivor would rip them to pieces and move on.