It's not a myth. Why do you think that the vast majority of people who switch to Apple products don't switch back? Only people who don't use both frequently, think it's a myth.
I use both frequently. We have one of each in our house. There is nothing more smooth about an iPhone vs an Android.
As far as people switching back, I would not switch back either if I paid way more for something that does not do as much as the phone I had before. I would convince myself it operates more smoothly to assuage my buyer's remorse.
But let's not get into a iPhone v Android debate. It is okay that you are happy with your iPhone and enjoy being part of a mindless cult-like shopping experience.