I've heard some of my less 'Bitcoin savvy' peers mention this, which suggests that it may be partially true, that some Greeks could be exploring Bitcoin.
Problem is, it's not as simple and as awesome as we would like it to be. Money is needed to obtain Bitcoins and (well) Greeks don't have this money. In fact, they now have less of it due to recent capital controls.
Put yourself in their situation. You can only withdraw 60 euros of cash per day. Then you see how the banking system/ATM's are already under stress by the current demand of withdrawals. You (as a person who needs cash to live) may not be 100% confident you can get another 60 euros tomorrow. Will you use what little cash you have to buy a fraction of a Bitcoin? Even if you are brave enough to do so, what will you do with it?
I highly doubt Greeks are going to rush into buying Bitcoins for 3 reasons:
1) They can't afford it
2) No way to buy it
3) It's basically useless.
In my speculation thread, I bring up an interesting idea to this problem.
https://bitcointalk.org/index.php?topic=1093512.msg11750864#msg11750864