Lane splitting/sharing can be VERY dangerous. Every year here on BF you hear about a handful of cyclists who get struck by the mirror of a passing car. The best way to ensure motorists who aren't good at judging the width of their cars won't clip you with their mirrors is to encourage them to go into the next lane to pass you. Whether or not they totally change lanes isn't the point, it's that they have a clear view of the cyclist and make sure they have room to merge into the adjoining lane, even if they don't fully change lanes.

Riding too far to the right encourages a car to pass without changing lanes at all. If a cyclist is not in a motorist's primary field of view/path of travel, he may not even fully register in the motorist's mind as being something that needs to paid attention to. How many accidents do you read about here on BF where the motorist's mind wandered and they inadvertently veered onto the shoulder and stuck a cyclist? Put a cyclist squarely out in the traffic lane and the motorist is far more likely to pay proper attention.

While I don't always agree with the leanings of Keri and company at CommuteOrlando with regard to bike advocacy and infrastructure, their tips and strategies for navigating traffic in the real world are quite good, and the online tutorials, videos and animations are outstanding.