If I’m driving, almost always, the exception being if it’s a highway off ramp I’ll indicate to go into the off ramp lane, then stop indicating as it should be clear.

If I’m cycling then very rarely, as the position in the lane or lane you’re in is far more noticeable than if you’re driving, so I’ll only stick my hand out to indicate if I have to merge into traffic to turn (eg a right turn from a single lane road, or to get into the turn lane to begin with)