Lane splitting can save your air-cooled engine, especially if the traffic moves just enough to prevent you from shutting off the engine. Most non-bikers see it as someone getting ahead of them in traffic--the reality, of course, is that a few bikers passing by won't have any noticeable effect on them.
If cagers can't see the lights, reflectors, and flashers on the bike, or the bike itself, they sure aren't going to see a vest. Most of these laws are an attempt to make riding such a hassle that it discourages newbies and the less-dedicated.
Governments want obedient and docile sheep-subjects, not independent and self-reliant citizens. We need to get government out of our lives, except for the functions listed in the Constitution, instead of making more and more laws that control our every action.
Off the
now.