Funny, today one of my coworkers was talking about how she used IDL at one of her previous jobs, and later I happened to see this comment. Neat coincidence :)
I think there is a bias for that, but I always love hearing of others who’ve used IDL. You should ask her if she knows of the coyote guide to IDL - I lived by it around 2008. Not sure if it was niche to my field or more general, or if it wasn’t a great resource before or after it was great for me :)