Watching four guys ahead of you mark and putt and mark again and putt again is enough to drive you completely up the wall. Of course they have to stand there and read the next putt all over again since the last time they were putting in their rotation was about a week ago! I will offer to mark before being asked if it looks like I am in someone's line or if it looks like I am close enough to be a distraction to them. I will always putt my way clear unless I have left the ball such that I have to stand in someone's line to putt my way clear.