I have a similar beginning story, especially with the wondering what people actually used it for. "Where's the terminal?"
My story diverged from yours when one of my Mac using friends said "Apple is releasing a Unix based OS." I thought "oh please make it Unix with an awesome GUI." I was so tired of working on my GUI in linux instead of working with it. I just wanted Wi-Fi to work, I wanted wake from sleep to work consistently, I didn't want my graphics drivers to break or be so much different to configure on a different device. I wanted a consistent trackpad experience. And Apple delivered. Some of my happiest feelings of my first Mac, the 12" mbp, were about how little I used it because I was able to open it, quickly do what I wanted, and then close it. I had been using Linux as my daily driver, but switched to OS X 10.2.6, and have been there ever since. Between then and now I've used a fair variety of unixes for work, like aix, hpux, solaris, FreeBSD, and linux, and I've never been without at least a few Linux boxes at my house, but I find that the macOS GUI does the best job of getting out of the way so I can get to work.
Every once in a while I try out a Linux GUI, hoping that I'll be compelled to give it a shot as my primary work environment. I have an old Thinkpad that I keep loaded with some desktop flavor, but I always run into things that steer me back to macOS.