It very much depends on the company you're working for. I've always been fairly keen on work/life balance and haven't found it that hard to find finance firms that respect (and even embrace) that way of thinking.

Finance firms have increasingly had to compete with tech firms for tech talent and many have moved to offer similar benefits.

Some do this because they believe it's inherently healthy, others because they feel they have to compete and it's a purely utilitarian matter. Others just offer more money instead. Interestingly, it's not always that much more in the long run.

Is it true that in finance you don't get RSUs but just get the money straight away in bonus?

It’s common to receive an annual bonus in cash, with some percentage deferred for a few years in some form. The form can vary: hedge funds often put the money into their fund(s) and you can withdraw it after a couple of years, publically traded companies tend to offer restricted stock units. The more you earn, that larger the percentage that is deferred too usually. The fraction can be anywhere from 5% to 50%.