A good rule of thumb is, if you are in dense complex traffic, to move your head around a bit when looking out and in the mirrors. Better coverage of dead angle in side mirrors, adding a bit more 3D into perspective.

Its sort of defensive driving - expect troubles, idiotic clueless drivers, people having heart attack or just turning head to yelling kid on backseat / nice lady walking nearby. Can't save it all but definitely helps.

Driving in country where people, when averaged, drive like crap is a good learning experience (albeit stressful). For me, whenever I enter France from Switzerland (on average 1x per week), its night and day and training (with cursing) resumes.

The density or complexity of traffic really has nothing to do with whether a car has been designed in such a way that it significantly impedes vision where it is most critical. In this case, a quiet roundabout with one other car almost directly in front.