Oh, it’s meaningful. That’s why Moodys did it on a Friday after the markets closed. They are giving investors all weekend to get over any panice and set up trading strategies for Monday.
Even after the latest bailout (which goes directly to the banks, not Greece), the losses are estimated at 70%. Yet the bond insurance is not being allowed to pay off on the losses. This will be the largest effect. Now everyone knows that bond insurance is a fraud. Which means bond yields in the eurozone will rise, perhaps sharply, to cover the newly realized risk.
Watch Spain and Portugal.
IMO everyone knows that Greece is going thru a slow motion default. It is not a matter of if but when. The EU is just buying time for a soft landing. Greece will be getting out of the Eurozone. It can't and won't implement the austerity measures even though parliament passed them. It is just some kabuki theater so the Greeks can meet their next bond payments and get the EU handout.