I’ve always liked TMP’s slower pace. There’s more time to “be there and feel it”, so to speak — usually for some emotional reason. The Enterprise flyby is the obvious one, but I’d say that’s just as true of everything from Spock on Vulcan, to intentionally-uncomfortable scenes on the Enterprise (Kirk unfamiliar with the new Enterprise; the transporter aftermath and its cold horror; the new seemingly-aloof Spock; the sheer scale of the cloud and V’Ger; etc). They’re slow, but they sure feel like they’re slow on purpose (even if apparently at least some of them weren’t), the same way a lot of scenes on Once Upon a Time in the West are. It’s less popcorn, more quietly psychological. To me, the story wouldn’t feel the same, or anywhere as good, if the same events were told in the space of an hour. (I recognize that this is a view not universally held.)