Yeah, I 100% disagree with Nalen Oga's attitude.
Probably an obnoxious and unpopular opinion, but....
Honestly, I feel that the pace of normal movies often can't capture anything that fully resonates half as strongly as these slower movies that take their sweet time do (when they're done as well as they can be, anyways). Like you say, you sort of need to have the time/excessive breathing room to sink into a moment completely in order to fully appreciate the introspection/intellectual gravity, poetic rhythm, and mood of every moment.
Yes, by default, I think our initial raw instincts are to reject stuff like that and opt for things that are much easier, but it's more worthwhile to be willing to trade accessibility and immediacy for the potentially greater and more rewarding heights in satisfaction that you can only get from more challenging things. I think the idea that the onous is on movies to be conventionally "fun", "engaging", and "actively hold your attention" is a mostly meaningless and limiting cop-out. If one wants to make the distinction between how normal people react and how critic-y film-obsessed types do, that's fine, but I don't buy for a second that the two are getting an equivalent caliber of experience-- The latter is getting infinitely more out of the medium precisely because of that willingness to put the effort in and try to tap into that frequency, and the former would benefit greatly from adopting the same attitude (whether they have actual film knowledge or not). The idea that the former have it right and that's what "movies should be about" is just total nonsense, as far as I'm concerned.
I do struggle with slow movies myself, like most people, but it is absolutely worth pushing through when you can manage the attention. While I don't have the willpower to do it consistently, enough of those types have clicked with me that I've concluded that movies are generally **** when you just fold your arms and expect them to cater to your immediate whims and meet you entirely on your own terms. The good movies are the ones that challenge you and eventually make you realize that your own initial terms were wrong and not really worth **** to begin with, and push you closer towards what's actually the better experience, IMO. And I imagine it's the same with any medium, really.