This is my impression too. The number of times I have been held up by someone hogging the outside lane, or had to change lanes twice around someone hogging the middle, is very low compared to the number of times I've been held up by a lorry overtaking another lorry on a two-lane road (perfectly legal, happens at least a dozen times every trip on such roads) or been aggressively tailgated while I'm overtaking traffic (not legal, happens about once per such trip)