I'd go further, and say that most of the time, "SQLite is enough".
But, yes, PostgreSQL is all I ever use for anything that needs to be big. I ported a big old web app that had ScyllaDB, Elastic Search, Redis, and probably some other stuff I've forgotten. It got PostgreSQL+PostGIS (it's a mapping app), that's it. I'm sure there's some situation where it would be worth looking at all that other stuff, but it's ridiculous to build all that complexity in before you even have users.
But, yes, PostgreSQL is all I ever use for anything that needs to be big. I ported a big old web app that had ScyllaDB, Elastic Search, Redis, and probably some other stuff I've forgotten. It got PostgreSQL+PostGIS (it's a mapping app), that's it. I'm sure there's some situation where it would be worth looking at all that other stuff, but it's ridiculous to build all that complexity in before you even have users.