Besides reducing pops and wind, my secondary purpose for the pop filter is to get my talents to a safe distance away from my mic. You won't believe how many VO artists love kissing microphones, and inadvertently dumping a gallon of spit into it. Can't stand a stinky mic.
That being said, if you have amatures going in front of the mics, they may be a little intimidated by the mic, and they will usually assume the pop filter to be the mic and naturally back away from it.
Minus giving our talents water, apple jiuce, honey, etc, it's really up to how conscious they are of their own mouth sounds. Getting a good VO artist usually helps you to avoid a lot of these problems. Otherwise you will just have to edit them out.