SPOILER ALERT.
I agree.
I read it in the summer of 1984. I enjoyed the large geo-political scope.
It is among the more intriguing half of the books (which were not assigned in school and in which I did not have an interest) that I've read just to be able to speak semi-intelligently aboout them or at least say that I've read them. Some of the others.... War and Peace, The Good Earth, The Mayor of Casterbridge, A Tale of Two Cities, The Eye of the World, Pride and Predjudice, A Pilgrim's Progress, The Sun Also Rises, Cat's Cradle, 1984, The World According to Garp, A Wrinkle in Time, Harry Potter and the Sorceror's Stone (I prefer the Philosopher's Stone, but I read what I read)...while The Book Thief and One Hundred Years of Solitude are up next.... You know what I'm saying.... it can be a chore to just get through some books while some are suprisingly great.
Anyway, I reread Dune in 2021. I was stunned at how quickly Paul accepted the prophecy and embraced his fulfillment of it. It was much darker than I'd remembered. I enjoyed the story, but I did not relate deeply with any of the characters.
I see Dune as a major inspiration for George Martin's Westeros. Sure the War of the Roses York-Lancaster fight can be seen in the Stark-Lannister clash, but the Atreides-Harkonnen war is just as important. The arcs of Leto and Eddard are similar. The story of Catelyn leading Robb to war and her worry of his romance with Jeyne recalls Jessica, Paul and Chani. The maesters of Westeros echo the Mentats of the Imperium. Worms.... dragons. Prophecy and lost tales.
I also see Dune as a major inspiration for Brandon Sanderson's Mistborn books. Sanderson plays upon the fictional books introductions for each chapter to set up a certain expectation. Ecology, prophecy, and the ingestion of specific materials empowers superhuman abilities.
The themes of the environment, protection of ecology, prophecy, teenage heroes, geo-political machinations, global economics, and ethno-religious diversity and identity are not new themes but all have been used repeatedly since. It's easy to similarties.
I am glad that I reread it though I don't see myself reading Dune again. I do see it as a solid piece in the history of sci-fi.