Not everyone likes to sleep in and some are just naturally up at 6am everyday anyway. I loved the FP+ system and I was very apprehensive of the G+ system but it worked very well for us. Even on the day we did sleep in we used G+ at MK and it worked well. We did not get to the parks until around 10:30ish and used G+ just fine.
You don't have to spend all day doing that. Ride a ride, refresh, choose a new ride, and put your phone in your pocket. And even if they did not have G+ the idea that you can go to the parks and not use your phone at all is a bit of a stretch. Aside from G+ we used phones to mobile order, scan various things in the parks, take photos, check upcoming weather, see where each other were in the parks with tracking apps, etc. Of course you could still go to the parks and not take your phone. That is a choice that you still have today. I wouldn't recommend it but you can still do that if you choose.
Then I doubt you'll ever be back to Disney again and will spend your time at Universal.