Absolutely. You can basically get almost the same experience as you would on a stock OS device, but with much better privacy. On the stock OS, Google apps get privileged access, so they can still access photos and your camera and all that, but what people don't realize is that their privileged access also includes things like usage data, hardware identifiers, etc. Using Google apps on GrapheneOS makes a lot of sense.

The only problems you might run into would be some features might require privileged access, things like Now Playing. Makes sense because normal apps cannot have unrestricted access to the microphone like that. Google Wallet works, but you cannot make payments because the app refuses to work on alternate OSes.

Besides that kind of stuff, though, I've used all sorts of Google apps without issues.

According to Terence Eden, Curve Pay allows NFC payments, at least in the UK