I hadn't heard of troubles in those two countries before before, though I'm sure like pretty much every country in Europe — or indeed the world — they didn't go entirely unscathed during a global financial crisis. Scotland, the UK as a whole and other western European countries aren't exactly in the depths of recession and unemployment that have been happening in Spain and Greece, for example.
Note the lack of mention of Norway (not that it's a eurozone country), which is in an incredible financial position with a $900bn fund made up primarily by saving a portion of oil revenue. While Norway has had 15 years to amass this huge fund, this is the model that Scotland would like to follow — as after independence it would have control of its north sea oil and gas revenue.
> In short, everything that has happened in Europe since 2009 or so has demonstrated that sharing a currency without sharing a government is very dangerous.
What happened was dangerous, though arguably the use of a shared currency and central bank helped countries support one another.
In any case, the most likely outcome in the case of Scottish independence is a currency union with the rest of the UK, in a similar manner to the Euro. If the Bank of England denies Scotland the use of its assets, it will also have to forgo Scotland's share of the liabilities, essentially wiping out Scotland's share of UK debt. So it's unlikely that Scotland's currency would be completely separate in any case.
All in all, while there are naturally unknown factors, there are plenty of reasons to seek independence and just in terms of economics — even excluding oil and gas revenue — an independent Scotland would appear to be in a good financial position.