Undercover:
What you mention last about "juggling everything the WTS throws at the elders" is right. You should see the sheer number of things just in the congregation we are expected to do (no one gets them done) and additional items to "serve kingdom interests" are just staggering. I think most elders would agree that the workload for an elder has jumped exponentially over the past ten years.
One of the things about serving as an elder that can make it untenable is that we're supposed to do everything. So, if you serve as an elder, you still are supposed to do everything that publishers are supposed to do. You can have two private meetings after the meeting but you're expected to clean the KH. You can have 150 hours of district and RBC work to do outside the congregation, but you are expected to show up and "be visible" in the field ministry anyhow. etc etc. It is different from being willing to do menial tasks, you are expected to actually do all of that.
But we don't. And it drives me crazy.