I routin ely use trucks and buses as blockers coming through intersections.
However, I have rules. I don't ride forward of the rear axle unless I'm 100% sure the bus or truck is going straight. I prefer being just aft of the rear axle, or even hanging on the rear corner, or a few feet behind.
But the one thing you absolutely don't want to do is be more than a very short distance behind. In that position the bus screens you from sight and a person timing his left to just clear will nail you.
So the key, either be in plain sight well back of the bus, or use it as a blocker, but not in between.
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.