There are two places where one quick peek might make sense, and doesn't allow the BG to move. One is in a closet, where there is no place to move to anyway. The other place is in a blind corner in a room, where you want to enter, but cannot pie the corner. In this situation, a peek will let you know if someone is in the corner, and and if he then moves from that blind corner due to your peek, you will see him because he will be moving from the blind corner to the area you can see from outside the area.
Whether this is good or bad depends on your mission, of course. A SWAT team, or military operation may need to go in anyway, in which time a quick peek may be counter productive. An armed citizen searching his house because he thought something was suspicious might find the quick peek under these limited situations worthwhile.