Yes, but that's very different - the Eurozone countries are not allowing another nation's currency to become their defacto currency, they're creating a pooled economy where they all still have a voice in the management of the common currency. (And it's still causing a ton of problems, when you consider what's happened in Spain, Italy and Greece.)

It's radically different from allowing your defacto currency to be one managed by another country, particuarly one that has no common economic interest with yours.

There's an exception to that: most European microstates adopted the Euro but aren't part of the Eurozone (nor the EU) and have no power in decisions made about it. Of course I concede that microstates have unique properties that break away from most considerations that are applicable to "typical" sovereign nations but it's not as clear-cut as you describe.

I'd argue this isn't inconsistent; these states are so small they effectively have ceded control of their economy, as well as their national defense, to the larger European community. Kosovo and Montenegro, for example, previously used the German Mark. This seems pretty close to an admission that for whatever reason (scale, stability) they're not able to issue their own currency in a credible manner.