I agree this is worth the big screen and (for me) worth ponying up extra money to get reserved seats in one of the fully reclining "full service" theaters.
I appreciated Villeneuve's quote:
" Frankly, to watch Dune on a television, the best way I can compare it is to drive a speedboat in your bathtub. For me, it's ridiculous. It's a movie that has been made as a tribute to the big-screen experience."