Oh man, my buddy learned this the hard way last month. He was too proud to check his phone and added an extra hour to our trail walk. Now he stops to look at the map like every five minutes, it's a total game changer.
Actually, checking your phone every five minutes can mess up your trail rhythm too! The real trick is stopping at every trail junction to look, even if you think you know the way. That way you stay aware without breaking your flow every few minutes. My rule is to verify at any fork or marked post, then put the phone away and just hike. It keeps you on track without making the whole trip about staring at a screen.