tldr; I found something similar when I forced myself to slow down on "The Wheel of Time" series recently.

I've been reading the Wheel of Time (started by Robert Jordan, ended by Brandon Sanderson). I'm on book 11 currently. I've found something similar in that the Jordan's later books in the WOT are basically just incredible slogs if you read for completion (which, I myself did around 20 years ago at around book 10, where I stopped). Around book 6 or so I purposely slowed down and started really imagine the scenes in my minds eye. I also keep the map open on my phone and just kind of keep note of where they are at different points in the series.

Obvious, but it is really striking how much better his books are when you try to "live in the moment" of your imagination as you read, rather than reading to move the plot and action forward. I was kind of confused with myself when I reflected on it. That I somehow thought it made more sense to skim through an entire series and take reduced pleasure from something, when I could just take 50% longer and actually enjoy it.

Made me wonder about where else I am doing this in my life.

I still thinks these books are radically overpadded. He was clearly in love with his characters and his setting. He needed the guidance of a strong armed editor imho. With all that said, if you are going to commit to reading a massive series like this, you might as well appreciate it in the moment, you are going to be here a while.