I actually used to buy a lot of media so I hit this problem before streaming. As soon as I had a backlog big enough with each type of media that it wasn't straightforward to burn through it, it became a cloud of equally possible stuff with the result I wasn't particularly invested in any of it. Most people were smarter than me re: dumping money into bits on a disc, but now that streaming and/or free-feed libraries have hit most media types, I think the experience is becoming more common.
I think it's a different version of Paradox of Choice: all individualization between the various choices is lost when there's too many. With PoC, the problem is that then you have nothing left by which you can prioritize. In this case, the issue is the loss of all joy you'd have found in the differences.
What's helped a little for me is going on "kicks," like finding all the bands I liked that did EDM-metal hybrid, or all the found footage movies I liked, etc. Constraining the pool you're selecting from first makes it easier, and having a mission of some kind makes it easier still.