The best films, books, songs, etc wouldn't be good at all if they only consisted of a series of unconnected climixes. There has to be a build up, which involves things that most people don't notice so that the greatest parts stand out. If they spaced everything out with 50% more wilderness interspersed between PoI, the PoI would be more climactic.
While this is true to some of the things it is not to others.
Music: Led Zeplin Stairway to Heaven very long compared to their other works but is often the epitome of their entire band. But there is no real definition of "music" so you can't compare music to games that well. Music adds to game but that's it.
Books: Tolkien work it describes into much detail of the world of middle earth into the point that questions are not often made of such most of it is backed up by Tolkien resulting into a very long but very dense and explicit world.
Now this does apply to movies because 2-3 hours you can't show much. Unless you do various movies combined into one (which ties into Tolkien and the Lord of the Rings trilogy that ruined tolkien lore with "hollywood" features)
Now in a game you can you have unlimited play time expanding such play time results in a most likely deeper and yet satifing experience. But you can also cater to those who do not want a "deeper experience" and just add bunch of progression and pretty shineys to the game. If Skyrim was larger (with the tools we have such as fast travel) it won't make any difference at all for those who do like shineys and do like progression and want to "beat" the game. But it will be a noticeable difference for those like me who want to explore the entire world without feeling cramped into the game world and passing 15 ruins every 15 minutes.