Splitting lanes will definitely cause you to be at the top of your game. For me it required undivided attention and acute concentration. After a while it can become mentally exhausting. Its sort of like REALLY "getting it" on a twisty mountain 2-lane. You either know the exact feeling I'm describing or you ride too slow on roads that are not twisty enough.
It's not for everyone. Then again, neither are motorcycles. I know a couple of motorcycle cops here in AZ that wish it was legal. It would make getting thru traffic infinitely easier for them when responding to an emergency. It would also enable them to cover more ground in a given time frame.
Resistance to change is common in nearly every area in life. How many people fail to embrace technology because "It just ain't right.", or they "Don't see the need.", or they simply don't understand it? For many, EFI was like voodoo. "Carburetors worked for DECADES! I dont need fuel injection! " The examples could go on ad infinitum.