Yes and no. What Bob said holds true for me, I work in the NW-N suburbs of Chicago. One of my associations does entirely 1-man work except for tournament, while another is typically 2-man, so it varies from time to time. When I work 2-man games, as I said, I don't bother with the batter's out verbal since it's not an issue.
In lower level games, especially at the 12-14, I use it exclusively, because coaches instruct players to take off every time they hear strike three. Saves time that way.
