I don't see us buying G+ during our trip (4 park days) for one main reason: Crisscrossing the parks to get to the reservation.
On the kids first trip years ago, they coined the phrase, "My feet hurt like Disney!" This was back during the old FP+ days when I could coordinate our ADR with FP+ reservations so I knew we wouldn't have any conflicts and could intentionally select rides physically closer together (or space out the timing to allow us to experience rides on the way from one FP+ to the next) to minimize the kids' walking. Once we used the pre-scheduled FP+s we would look for our next one close to wherever we were in the park at that moment (unless there was something open we were afraid we'd miss if we waited).
If they added the ability to MODIFY a G+ reservation without cancelling the existing one first, or allowed you to make a new one, but warned you doing so would cancel the existing reservation and restart the 120 minute cooldown, I would likely give more consideration to purchasing G+. Why they set up the app with no ability to modify to a different time (not a different ride, just the time) when it pops up makes no sense to me.
While I understand the principle behind G+ not allowing rebooks, I think it is a poor decision on WDW's part.
I also find inexcusable the fact that the process of setting up a G+ reservation (or worse $LL) often results in the time you initially were offered being pushed back, sometimes significantly. For example, in the time you took to get that 1p SDD slot, it got pushed back to 6p, conflicting with your ADR (which you'll have to pay for if you miss/cancel), so you decide to drop SDD. But now, you're that much later in getting your replacement ride/slot, which will probably not land where it was initially offered as well. Insult to injury, it is possible the time lost to SDD means you have missed out on another ride/slot you COULD have otherwise gotten if only you hadn't been spending time trying to land SDD at 1p. The first part of this scenario is one we've heard repeatedly; the second part might be a bit of an exaggeration, but I don't think it is by much.
I absolutely agree that TWDC is burning through the nostalgia and good will that brings back those prized Boomer/GenXers with disposable cash who fell in love long ago with what WDW once was. On top of that, they're not making any new die-hards with the way they're running things right now, COVID or not. Once the older Disney-Lovers are not longer willing/able to enjoy the parks, there will be few/far between those to replace them. And looking at these boards and others, it isn't an insignificant loss they're looking at. Long-term, they need loyal return guests not only for dependable income, but also for the glowing reviews they pass on to others about how they've, "never had a bad Disney trip, no matter how many times I've gone!" If everyone starts doing one-and-done vacas to the World, I think a trip to WDW will lose some of it's shine after a while. jmtc