@ZeroIt's true that Skyrim can be played as a neverending game, but you could also see it as a game where you decide where it ends. There are a few major plotlines that you could decide to follow, and tons of sidequests - some of which lengthy enough to be seen as a major one, if you'd like.
Me though, I obsessed about the game when I first got it and could barely stop playing it, but today I mostly play it almost the same way I used to play Animal Crossing. I visit Skyrim every once in a while just to see what's up. Because there's always something to do, and despite the game's traditional Bethesda jank practically everything you do feels rewarding in the end.
Sometimes I decide to just walk aimlessly straight into the wilderness somewhere and see what happens. Even though the tech's not the cutting edge anymore it's still a game full of beautiful scenery and with Jeremy Soule's atmospheric soundtrack in the background a simple stroll around Skyrim becomes something almost meditative. Until you run into some panicked victim of a recent assault, a frost dragon swoops down to attack a nearby settlement or you spot that guy that you suspect killed your friend from that one quest a hundred hours ago, but all of that's amazing too and will never not feel welcome to me.