Moving with traffic at the prevailing rate of speed is not at all like driving where prohibited. If you don't like the fact that turns are prohibited at certain intersections, or during certain times of day, do you think ignoring the signs "en masse" would result in a change in the law? No, it results in a "blitz".
Rob's right - the only way, or at least what seems to be the only reasonable way, to effect change is to get a champion that will be heard. I'll admit, I've been part of a petition that I ended up losing interest in. Why? Because I ride on those parts of the highway infrequently during rush hour. There are no HOV lanes on my commute. Rob's other point is that we need a new and convincing argument - we can't claim to be greener than green cars, or take up less space than cars - because both of those is debatable.
My argument was for safety. Riders are safer when they don't have traffic on both sides. Riding in the right lane doesn't really provide that because of the turbulence of entering/exiting vehicles. Riders planted in the left lane are technically not using the lane properly, because it's a passing lane. Where an HOV lane already exists, however (I'm not advocating building lanes for bikes), riders could use it. Although it's on the left and some motorists treat it as an "even faster" lane, it's not. It's a dedicated lane, a priority lane for vehicles that meet certain criteria (which is why we should be calling them HOV), so traffic speed is traffic speed. There is a shoulder of some description on the left with no traffic, and a buffer zone with limited entry on the right. Sure, the lines don't prevent everyone from crossing, but the point is there is a law to reduce movement between lanes. That makes the lane a safer spot for motorcyclists - and one of the primary directives of the MTO is the safety of all road users. This can be done at no cost, and with only 3% of the registered vehicles being motorcycles, low impact to other road users.