I think people who require the use of any addons are idiots .. and also people who think that something like that should be forced.
Well i don't agree with this wording. I can see both points.
I don't know if you are leading any raids, but for my part i will require the use of addons and i have not met any raid leader of a continuous raid group on my server who does not. PuG's don't have standards, but they also don't meet on regular schedules and have a goal.
And to me it's seeing a full PuG using threat meters is a usually a good indicator for a good run and never turned out bad, e.g. people overaggroing, tank being unable to keep aggro and similar.
But now the discussion will most likely belong to general.