I found myself constantly checking my phone - certainly more than I would like. I was especially guilty when I was upping the amount of running time.
What worked for me might seem counter-intuitive. I bought an Apple Watch last November. I wanted to be able to start and stop sessions more easily, especially since I was going to be in races starting in January.
Well, now that I've run the long runs, I find myself checking the watch less. Of course, I have Runkeeper (and, before that I had MapMyRun+) giving me updates in my ear every half-mile. Those updates seem to satisfy most of my "need to know" when I've been doing my 4/1 intervals these past couple of weeks (4:00 jogging, 1:00 walking). When I was on the longer sessions or in a race, I didn't much care about checking the watch at all because of the half-mile updates.
But I *will* say that, if it wasn't for the music, I don't know that I could do this. Even now, when a song comes on, I might mentally think (if it's a long one) "Ok, this one is long enough that I'll get the break AND the whole next jog interval in it" or something like that. Just the way my brain works, I guess.