I'm on my phone a lot for work when we are at home. At WDW, we keep our cell phones with us in case we are separated and need to contact each other or our families elsewhere need to contact us, but other than that, we absolutely try to limit cell phone use at WDW. It is a time for me to put down the phone and focus totally on DD. (Occasionally checking wait times on an app before we go to another side of the park is pretty much what I try to limit it to during the day).
Unfortunately, WDW has ruined that. On our last trip, we got the joy of MDE/FP+. MDE is glitchy and rarely works. Also, if it does work every time, you try to change a FP+ it pulls up different times, so you may have to try to make the change multiple times before you get the times you want. Sometimes you have to keep moving the FP+ closer to the time you want and try again, to get the times you want to come up. FP+ makes you plan too far in advance, and when you get there, we found some of the times don't work, or you don't want to waste a FP+ on something that has no line when you get over there. Because MDE is glitchy, I spent a ton of time messing with my phone trying to get it to work and things to change. Because it works better from the resort, than in the parks, one evening I spent an hour at the pool trying to switch our next day to EPCOT from MK, instead of playing in the pool with my daughter. It got to the point where DD (7 at the time) started getting upset and complaining about me being on the phone so much. We also about got run into several times by people using their cell phones trying to work MDE instead of watching where they were walking. We are all pretty unhappy that WDW has elected to tie us to our phones.