Here we go:
Those occasions when there's a cyclist you need to overtake or a parked car on your side of the road and there's a car coming the other way and you might just be able to squeeze through but you're not sure.
Remembering to use mirrors at every junction or change of lane/direction, especially when you have to signal, watch other cars, lights, pedestrians, speed, gear, etc.
Bay parking
Being scared at some complicated roundabouts/junctions due to not wanting to infringe in to other driver's lanes.