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And now they've come full circle - https://www.youtube.com/watch?v=CEG9pFNYBCI

This isn't true and was never true; currently don't have time to point out why it's not true but I will get to it as soon as possible.

Accounting and planning people, who use Excel today, were never APL users.

APL was popular in the operations research community, and those people are now mostly R users (but they left APL to SAS, Stata, S/S+ and a few others through the years, before adopting R)

APL might not be super popular, but array languages are widely used in data heavy industries.