Interestingly enough, I first switched from 3.X to Pathfinder because of D&D 4E. I hated what I saw when it first launched, and just didn't have the slightest bit of interest in playing it after reading through the PHB. Everything felt the same, not at all like what I was looking for. Pathfinder felt comfortable, familiar, especially since I'd been playing 3E since it launched.
Most recently, I switched back to Pathfinder from D&D 5E (within the last two weeks, after playing 5E for about a year). Pretty much everyone was just starting to feel fatigued with 5E and its lack of new products that weren't adventures, while Paizo kept up with a steady flow of new stuff. Granted, Pathfinder is pretty bloated now, but I can generally find something I'm looking for without homebrewing it like I had to do with 5E, and with the various classes and class archetypes (many more than 5E currently has), the player characters feel a lot less samey than they were getting to be in 5E. Literally, the last three campaigns we had with 5E always had at least 1 or 2 paladin/sorcerer builds, along with at least 1 or 2 players with at least 3 levels of barbarian, with nobody ever touching a ranger. Customization is a big thing for me too, and getting to spread skill points around and being amazing at some things and okay or kinda bad at others just feels so much better.