We were just there last week and did not purchase
Genie+. We did purchase ILLs for two rides - Rise and FoP. (Rise ended up being a waste of money because it went down right as we were to board the "vehicle", we got escorted off, and everyone got an ILL to use - but we didn't get a refund for the one we paid for.)
Anyway, we found we were able to do most things we wanted, just by watching wait times and using some options like early entry OR being in the park at close and getting in a ride queue then.
To ride Slinky, we hopped over to HS to watch Fantasmic and then beat feet to Slinky when that ended. In line probably 20 minutes to ride, plus it was dark and cool!
For AK, we utilized early entry to ride the safari first thing - walked right on - and got to see a lot of animals eating. We rode it again later that day with maybe a 10 minute wait. Rode Everest as single riders. Rode another day later in the afternoon and there was no wait - so we waited the few extra minutes to ride in front.
I would say MK and HS are the hardest parks to navigate, but we still managed to do most things we wanted in MK. We rode Big Thunder when it reopened after being closed for lightning strikes. It wasn't showing as open in the app, but we were nearby and could see cars with people in them so we hustled over and walked right on.
So sometimes, it was using the app, sometimes it was just being aware of what was going on and how things work at Disney.
In general - it was a different kind of park day. Each day was riding a few things and then wandering and taking in the scenery. It wasn't like trips past for us where each day was jammed full of riding everything.