It was though? I remember a default being a real option in the media.
But in the end, it was clear that unlike in Iceland, bankruptcies were not considerable, and so a bailout was going to happen. The only question was how the bailout would be structured.
Yanis Varoufakis made his name back then by going against the grain and proposing a hairsplit, but instead an approach was chosen where Greece never really defaulted, but its population was harshly punished for it.
A default plus Greece unilaterally continuing to use the euro was the scenario hardly ever evoked.