Feb/March rally had higher volume on the rise. And there was no Grexit or international events happening then. Thus, I don't think this current rally is based on more people rushing into bitcoin as some sort of safe harbor.
Where did you get your volume data from?
Looking at blockchain's USD volume chart it seems that volumes are on similar level:
https://blockchain.info/charts/trade-volume?timespan=180days&showDataPoints=false&daysAverageString=1&show_header=true&scale=0&address=Conclusion: This rally is considerably less healthy than the Feb/March rally.
Depends, if the Greeks are significant part of this rally (and Greek exchange had noticeable increase in deposits) then this one should be much healthier (as they would be buying long term, as a store of value rather than quick fiat profit).