Oh yea. Absolutely. It's incredible.
Best part is that there's no reason that should change with scale. As long as one continues to ignore global feeds and opt out of any forthcoming algorithmic relays or clients that they're not interested in, their experience of nostr - and their experience with their social graph, the actual humans - would stay exactly the same even if nostr had 100 million users.
That's the power of true dark forest tech: the right for you and your little tribe to be left alone by the wider population.