Visiting the UK (from the US) it was pretty clear that the social boundaries were different, but the general nature of the game was the same - we're both guess cultures: you have to figure out what to say and how to say it.
In the Netherlands, conversation seemed much more unguarded. It's hard to describe but it's similar to a concept in the US of someone "having no filter" - basically, less verbal softening of uncomfortable/taboo subjects and more willingness to engage with them.
I actually find the Dutch way very refreshing in some ways. Soliciting critiques (e.g. "how does my new haircut look?") is a largely pointless exercise in the US because there's strong social pressure to say "it looks great" whether it's true or not.
I do wonder though if the Dutch way of making friends (as adults at least) has to be wildly different than in the Anglosphere, given how big a role those subtle social cues play here.