They voted in a government that ran on the platform of either leaving the EU or getting their debt restructured, neither of which took place. Yanis Varoufakis was the head of those negotiations for the Greek government, as their finance minister, and tells an interesting story about how they went.
They will default on their debt, it is impossible for them to pay it back... The people are more than likely apathetic about the whole situation. Our referendum was not nearly as important as theirs, but ours is likely to cause a lot more problems.