What to expect from a cruise bar?

I (36M) am going through a sexual rebirth of some sort, after a few years without hookups, gaining more confidence etc… What’s in a cruise bar? Can you easily speak to people? Is it a friendly safe gay space? I’ve never been and trying to push myself a bit as I’d like to meet more guys to explore sex with.

I’m worried it might be more of a quick release pump and dump kind of atmosphere, so I’m wondering what your experiences have been like. And if you don’t recommend, please I’m all ears for alternatives.

I’m in London, UK, if that informs your replies.