I'm a curmudgeon. I will most definitely be the last on my block, and I still won't have one.
I used to think the same way as you, only had a non-smart phone to have a means to make emergency calls or as a necessity for receiving calls. Recently made the switch to a smart phone, and find it indispensable. They do so many useful tasks, I kick myself for not getting one earlier. My iPhone, Watch and MacBook Pro laptop work seamlessly together. I receive calls on my Watch so I don't need to grab the iPhone; the Watch also unlocks my MacBook Pro as I open the lid so I don't have to type any passwords. I ask Siri for the nearest whatever to me and it tells me how far to walk or drive and tells me where the store is, all without having to type. Convenient for snapping pictures and they're instantly sent to my other devices. Not to mention getting text messages with pics from my extended family. To each his own; I enjoy smart devices.