You might think searching for tabs may be ”the thing“ – I understand that idea.
But it actually isn't, because the tabs – even hundreds of them – don't change position much and the human ”spatial/location memory“ is quite well developed. So it only happens ever so seldom that you search for an open tab and don't find it hovering in instances.
On the other hand, it happens a lot more often that you accidentally close a tab and want to re-open ist quickly; not using keyboard shortcuts the ”Tab Menu“ comes handy there – much more convenient than unintuitively being redirected via the (sometimes painstakingly slow) history panel.
opera://flags/#search-in-open-tabs came handy for me, there, for the time being]