For us it's generally an options available thing. It has paid off too. When we went in 2019, we really wanted to do Smuggler's Run, but at the time they didn't have fast passes or anything, it was all standby and every time our group looked at the times, there were nearly two hours. Well the last park day we were over at Animal Kingdom and it got pretty cold, for Florida anyway, around low 50s if I recall. People started clearing out at Animal Kingdom so it got me interested to check the
MDE wait time for smugglers run, it said 20 minutes... We had about an hour I think until park close, so we rushed to the bus, got to HS, and got in line. Sure enough it took about 20 minutes and we were on. Came off the ride as everyone was funneling out of the park still and all in all it was great.
We like it in general, as we have so far only gone with our friends, so all adults. We are usually there at rope drop so we get our fill of most things we care about by lunch. Maybe it helps that we refuse to wait in a standby line for longer than maybe 30 minutes. We head back to the resort and relax for an hour, then head out to the next park.
I think it also helps keep the park visits "Fresh". Again on our 2019 trip, we would go to Epcot in the morning, go back and relax, then do Animal Kingdom at night. Then a couple days later we may start our day at Animal Kingdom. As most know, the parks have a very different look and feel during the day than night, and by jumping around parks instead of going back to the same one, I feel we enjoy the parks more than if we tried to do just one park all day, even if we still took a break in the afternoon.
It's tough to explain I guess, and to each their own. But the key thing is even if we end up spending the same amount of time at each park over the entire vacation, it feels less like a chore than when we have tried to just get everything we can out of a single park for an entire day, and I don't believe WDW should feel like a chore if it can be avoided.