I remember the fad. I was around for the Extreme Programming era. But, I've never worked anywhere that pair programming was the norm, nor have I known any developers that wanted to pair program, in the general case.

My personal experience is, of course, not representative of an entire industry, but I just have a hard time imagining it being a common thing. I like working with other people and helping juniors sort out their problems, but I'd quit my job if I had to take turns writing code while someone else watched and just sitting and watching someone else writing code. Both of those things seem horrible, to me.