As per boredom (I'm 60, so, yeah, grew up without smart phones), best thing that can happen to your creativity. All my good ideas come from stretches of boredom (driving long distances for example). I love boredom.
When computers came firmly into my life, it was solitaire games I had to actively delete from my machine. So many wasted hours (I thought).
Note: we 60 year olds wasted plenty of time watching shit television content long before smart phones (and computer solitaire) came to be.
I have only just slightly made a little peace with this time-wasting habit. I've come to see that there is time of decompression that I sort of seem to need in the evening. As I say, it used to be TV where I would find solace in "vegging out". Lately it's YouTube.
Perhaps we can accept this but find better ways to veg out? I personally think YouTube is superior to the crap TV (and, god, commercials) of old. But drumming, playing guitar, reading ... these are better still.