I switched after the Samsung Note 7 fiasco, never looked back, and have never missed it. I was a pretty hardcore Android nerd too, built custom ROMs and kernels and whatnot. It takes a second to get used to but once the muscle memory is there it’s seamless. As far as apps, I think what you’ll notice is how noticeably polished the iOS versions are, and you’re gonna love the battery life, especially if you’re coming from Samsung.