What an insane idea. I know you're "legally" entitled to take up the entire lane on a bicycle but if every cyclist did that it would cause a traffic nightmare for one simple reason. Cyclist rarely come close to traveling at the posted speed limit which would make things 100 times more dangerous.
Perhaps, but that is what I do occasionally. I do this for one reason only, to be seen.
If the situation is hairy enough, get off the road.
If there is no chance to get off the road, look as big as you can, that way the car will see you.
For me, safety first. My routes usually avoid cars. I ride as slow as I can sometimes, with the entire road or bike lane to myself.
But in traffic, ride at a certain pace, 15 km/h to 25 km/h, and look big.
Riding fast in traffic makes the bicycle seem slower to the cars on my ass.