Now we might speculate that Greece couldn't have avoided this, even if it weren't for the Euro, but having lived this from the inside, I think that it wouldn't be that painful.
Countries like Japan, Italy and even USA nowdays, have comparable debt to GDP indexes, but none of them (as far as I undestand) have had this kind of dorp in living standards, price inflation or increase in poverty rates since 2008.
Best of luck to our Bulgarian neighbours. They are going to need it!