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Agreed. Nobody I work with has ever called it Etsy. Etsy is a shop where you buy handcrafted things online.

Agree. Most English people at least would be nonplussed if you said "etsy etsy" rather than "etcetra etcetra" to indicate something that goes on and on.

American here and I say “et cetera” when I mean “et cetera”, but /etc is “etsy”.

That makes a little more sense. /etc is e-t-c for me, but I may be in the minority there.

Most UK English speakers would be confused if you used 'nonplussed' to mean confused...

Human languages are hugely inefficient!

Do you mean AmE speakers? Because 'confused' is (roughly) what it means to me, a BrE speaker, but your comment made me curious and indeed Wiktionary gives def 2 (proscribed, US, informal) as 'unfazed, unaffected, or unimpressed' instead.

Only the directory is pronounced etsy. The rest of the time we say et cetera.

I don't even know how widespread etsy is for the directory. I hardly ever hear anyone pronounce anything, since most communication among programmers is written.