I totally get all that.
One good tip, but this is just for client, is to take those extras and mark them as hidden. Collections will still show them, but they won’t show in your library, thus cleaning up a lot of cruft. This is a great tip for content you ONLY want to see via a collection like say Stand Up specials or old Wrestling events
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This won’t, and can’t, happen in the web admin though because if we hid them, you’d never be able to get to them.
As for scrolling a ton to get them into your collections, I think V2 will absolutely improve this for a couple reasons. You can quickly add items to a collection via their context menus now, and those menus are available more places, like rows and the grid. So you no longer have to dive into the content page to manage them this way. Hopefully this saves time, and your place.