Bikers often complain that cars won't wait for 20 seconds in order to pass safely, endangering cyclists by passing too close, cutting people off, right hooking etc.
However, I notice that a lot of people will ride right up next to a big truck at a stoplight, without much care for whether it's about to turn right. After surviving my first right hook with only bruises, I've made it a policy not to pull up next to a big vehicle, or really any vehicle, unless I can be certain I can get ahead of them before the light changes. I'd rather wait patiently behind them for a few more seconds than to chance them starting to move and turn across my path as I try to squeeze around. I understand that the safest place to be is in front of all the vehicles (like in a bike box), but I also understand from personal experience that the most dangerous place is to be 3/4 back in the blind spot, and if there's a chance I won't make it to the front of the queue before it starts to move, I'd much rather just wait behind, in normal traffic.
This is especially true with big delivery trucks, busses and construction vehicles, where not only is the mass (and danger to an unprotected bicyclist) greater, but the reaction time is slower and the blind spots bigger.
I know that the Portland OR water department did a public service outreach to cyclists, inviting them to climb up in a big rig and see how big the blind spots really are. I think that it would be illuminating, and that a lot of people would think twice about biking up into those blind spots if they had a real sense of what it's really like up in that cab.
For me personally, I'll wait the extra 20 seconds and just hang out in the lane behind, thanks. My life is worth a little delay.