I suspect Disney does not make it a policy to call when something like this happens because they don't want to turn it into a dozen rounds of "Let's Make a Deal," but clearly many people do.
Outside of a very small handful of things - tragic accident, room being destroyed by fire/flood/plague after your arrival, alien invasion, I cannot imagine what FOR ME would warrant a free room. "Free room" wouldn't even cross my mind for a single circumstance described in this thread.
I'm not debating what warrants or doesn't warrant total room compensation. That's subjective and there's no right or wrong. When things are so bad that it's been determined by all parties that compensation is warranted I don't see that as a windfall. It baffles my mind how often on here this type of compensation is seen as a positive. It's not. It sucks.