So far, haven't needed queuing outside of a single thread in the application (I know, what happens if it crashes!) Hasn't happened in ~8 years. Won't cry if it does.

I have an app that uses an in-memory queue too in one thread :-)

I'm curious: why do you queue instead of directly writing to the database?

At the moment, I queue to batch insert real time data at ~5 second intervals. It seems less wasteful of resources, but quite frankly is probably not needed.