No, really, I very rarely need to signal in traffic. Maybe traffic density and intensity plays a part. I only do it when I can be perceived as blocking the lane and there is only one lane, and the street splits into two or more directions. To avoid having the traffic behind me try to pass me before the turn, I signal my intention. That allows them to position themselves properly.

Other than that, I sometimes need to signal for a lane change, but usually I just look behind me and move when it's clear.