I used them as well, and I know of at least 3 more coworkers who use them as well.
I got started when I got one for free with a used computer I bought. I’ve since then switch full time to using an MX Ergo (like OP) on my desktop, and a cheaper M575 I keep in my laptop bag.
I even game with them, and haven’t touched a computer mouse in probably 2 years.
The MX Ergo is far superior to any other I’ve used, highly recommended.
To quote the author himself:
But then he proceeds to do the exact opposite and posts a vitriolic rant about how everyone who doesn’t use what they use is, in their words, and idiot.