The figure is $2,193,000 for Washington State. Considering that even starter houses are over a million bucks here, I bet that sweeps in quite a bit more than "nobody".
WA state has a population of about 8M. Its citizens decided in 1981 to switch from an inheritance tax to an estate tax.
This citizen-driven state law affects slightly more than 2% of the US population, in theory.
In fact, median household income for WA in 2019 was about $78k, median household net worth in 2019 was about $400k, and median family net worth in WA in 2021 was $865k.
So in reality, even within WA state, almost nobody is paying the state estate tax. Here's the Seattle Times from 2019 on the incongruities in state wealth distribution. But notice that even in their numbers, home owner median net worth is still only $900k, less than half the state's estate tax threshold.
It seems likely that this number has increased since 2006. But by how much?
The same report noted total estate tax revenue at $100M. Adjusting for inflation, and using the total revenue number from 2019 ($297M), it would seem that total revenue has just about doubled. If we make the egalitarian but hardly realistic assumption that the gain in total revenue number has been driven by an equally distributed gain in the value of estates, then it seems that a reasonable back of the envelope guestimate is that in 2019 or thereabouts, roughly 1% of annual deaths trigger estate tax liability.
[ EDIT: in addition, this page from the WA OFM seems to show that whatever the revenue from the state estate tax, it is so low that it doesn't even get it's own category in a chart of state revenue sources:
It's not nobody, but it's a hell of a lot closer to "almost nobody" than "this is a government policy that significant numbers of ordinary people have to worry about".
[EDIT: this page from the WA OFM suggests a possibly notable increase for 2019-2021 estate tax revenue, among other increasing sources of revenue. It's not clear that the increase changes the accuracy of my final paragraph (pre-edit)
