I use it almost exclusively/when it makes sense to. But so many people are surprised that I use it.
Part of it is because I was an android user until about 2015 and that was always a feature on the phones I had. I also use it because I have small hands and the biggest iPhone so I find it easier to type one-handed sometimes.
I physically have to with my iPhone 15 Pro right now because manually typing as quickly as I do causes every 3-5 characters to not be registered.
And yes, I swipe type faster than most people type, but it took awhile to get to this point.