Bit harder now post Brexit though
Almost all of the people I knew who did gap years before or after university went to either Australia or New Zealand (from the UK) following a three teaching-year degree with an extra industrial placement year - Australia in particular have (had?) a scheme where someone can live and work for a year with few restrictions provided they are under 30, and could extend that to two years if working in a rural area for some of that time.
I've moved to the US and can see how things are very different culturally with regard to travel. Others have mentioned that the US is not into backpacking. I think it's less about that, and more about travel being a prize for retirement.
I've seen this changing a bit in my time in the US, but it's still the norm for a lot of people who then end up being unable to travel. The US has many more people who are skilled and equipped for a backpacking lifestyle than I found in the UK.
I assume "backpacking" in this context tends to mean riding trains around Europe, staying in hostels/couchsurfing/etc.
The US has a fair bit of backpacking and camping in National Parks/Forests/long-distance trails although it's not necessarily a fully mainstream activity. But much less of the "European-style" backpacking.
I think it's partly a difference of scale and ability to get around without a car once you get out of a handful of (mostly expensive) cities.
My understanding is that workers get a year of maternity leave, a few weeks of paternity leave, and there is some sort of sharing arrangement whereby maternity leave can be used to extend paternity leave.
When maternity/paternity leave ends, the worker must be given their job back.
I'd expect that at many employers they can't just have the work that someone on leave would have done go undone so they are going to have to bring on someone else to do it--someone who knows that they will only be needed until the person they are filling in for comes back from leave.
Thus, I'd expect there to be a need across nearly all industries and at nearly all skill levels for people who want to fill a 6 month to a year opening.
Compare to the US (Federal 12 weeks maternity leave if your company has 50 people, no legally required maternity leave otherwise--individual states sometimes add more), where openings for people to work a temporary job for a few months tend to either be low end jobs or very specialized consulting jobs. The former don't pay enough to afford a 6 on/6 off lifestyle, and the latter are out of reach of most people. There aren't many good middle-class jobs to support 6 on/6 off.
I've met people who do it on a 6-months basis - 6 months travelling, 6 months earning. They don't make much, their career is somewhat stalled, it would have probably ended when/if they had a kid, but they did it. They were conscious that they were sacrificing something (money, comforts) in exchange for this lifestyle.