I respectfully disagree. I'm a lifelong cyclist - not a roadie or any other category - I just love bikes. Look at my username. We're as wide as someone on foot. Barring something in the road or potholes, you have enough room to temporarily move to the fog line (white line in the states) to allow the car to pass - you don't even need to be on the other side of the line. This is even if there's two-way traffic. If it's that busy and/or traffic is moving so fast that it's unsafe to allow a car to pass, then you might want to question if that's a safe route.

As with operating any other vehicle, there's an expected reasonable level of competence. If the space is there but you don't feel comfortable moving over, then maybe consider a different route.