A smart phone can be a huge time suck if you let it. No different than the machine most of you are probably reading this on. That's operator error, not the fault of the tech.
I got an iPhone 6 about a week after they came out. I am by no means a phone zombie and only make/receive a few calls on any normal day. What I can do is text my daughter, answer almost any question, read or write in languages I do not know, turn down the stereo, check the forecast for anywhere before I leave on a trip, make a reservation at the kennel, pull up any song or almost any book I want to listen to or read, turn up the kitchen lights over the stove when I'm cooking, turn down the thermostat when I'm cooking, figure out all the details of my next golf shot, lock the garage door, leave myself notes, get birthday reminders a week ahead and on and on... Almost all of that can be done with voice commands. I could even call someone if I wanted to! To each their own, but I love the technology. I'm still on the learning curve regarding the apps I will use in my work, but have no doubt the phone will (FAR) more than pay for itself as soon as I get up to speed.
The only annoyance I have with any of it is the, IMO, over-use in social settings. We implemented a rule when we entertain. No devices at the table or in the mix-and-mingle areas. I usually have to hand out a few gentle reminders, but that's about it. Works for us.