We never book ADR in advance (well, never say never but it's very rare)
We book what looks good about an hour out from when we want to eat. Never gone hungry and never eat QS either.
We wake up in the morning and want to change parks, we do. We just hop on
MDE, look for FP at the park we opt to hit that day and change them. Never found it to be a big issue at all. Other than FEA, we can get FP for what we want without issue. If we have FEA booked, that's the one time we stick to our plan.
I think people put way more emphasis on planning than it really takes. Especially the ADR part. We've not planned at 180 days period, much less worried with ADR then. And we've eaten at over 80% of the TS locations at Disney.