Man, this truly is the game of all time. But in all honesty, it's very fascinating! A lotta weird stuff, weird items that don't seem particularly useful, at least to someone who doesn't know the game's mechanics inside out, and there doesn't seem to be a particular objective... but I'm very ok with that! It's kinda fun to just see how far I can go without dying or screwing myself over, experimenting with the resources and tools you can find around!
Maybe it's kind of silly responding to a comment from two years ago, but just in case, (a) I'm glad you like the game so much ^^ and (b) I think just about every item in the game does have some really handy applications, but it depends a lot on your build and what point in the game you're at etc., plus what sort of playstyle you're using (e.g you'll rely more on certain items if you're trying to avoid using gold). A lot of the items are useful to patch up specific gaps in your build, like as an alternative to speccing into another class and leveling it to get some skill you would otherwise want; if you're trying to level a specific character/class combo up to 8 as fast as possible, there's usually some palette of items that will help a lot with that. Sometimes they're fun for RP reasons and things too of course.