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I'm also a very old user, since the first days of the service, and I don't know how many saves I have it inside (will see when my export arrives).
The latest iteration's search was abysmal, and I normally refrain from using strong words. It failed to find exact matches from titles, the words or excerpts I know that exist in the article I'm searching for, and as a result, it became a FIFO basically. Unless you consume the list directly, hitting something you are looking for was nigh impossible.
After being berated by support to use the search "properly", I started to build my own app, a TUI tool to curate the list, but it was going slow. Honestly, I'm a bit relieved now since I'm free from developing that software, and I can dig the data in my own terms.
BTW, my export is just arrived, and it's a series of CSV files which has the usual suspects as columns. I can import this into a SQLite and dive the way I want.
One less thing to worry about, but this doesn't mean I'm not bitter about its demise, too.
Edit: It turns out I have ~37K saves. Whoa.