Are you British? I (American) have been pronouncing it "etsy" for over 20 years. When I hear something different it's usually from someone who is new to unix and just hasn't learned all the jargon yet.
As always, it's just what you're used to. I freely admit that the US date format is weird, and that most imperial units are bonkers, but they're immediately "intuitive" to me just because I grew up with them. I just can't "feel" things like celsius or kilograms.
