"... to the typical six figure rates seen in the US."
You need to get your news from more than one source. HN is not a representative sample. I can't overstate this.
I can tell you that having lived in the US and Europe it is MUCH easier to travel as a European resident:
* 21 days of vacation every year, by law, that people actually use. 6 weeks for some places, like Germany (how do you think it is they travel so much??) In the US if you get vacation it's common to be shamed by your coworkers and bosses if you use more than a few days. A friend of mine works for a company with "unlimited vacation". He just visited Morocco and Portugal for a few weeks and was chided by colleagues for it. He is an incredibly talented and in-demand engineer, though, so he can tell them to shove it. Most people cannot.
* You can leave your job and not be stuck with terrible health insurance (Obamacare is a start, but when you're a footloose 20 something what the hell good is a plan that costs $150 a month and has a $6000 deductible?)
* If you have student loans at all, they're generally quite small.
* The social safety net is stronger; jobseeker's allowance, the dole, etc. are not as hard to qualify for as unemployment is in the US. Think to yourself - in the US, the worst possible consequence of taking a vacation is that you'll be sleeping in gutters after you get back and your boss fires you to set an example. In much of Europe you collect benefit (modest, but still something) and live with roommates.
* Cars - it's a lot harder to save when you're basically forced to spend $250-$600 a month for basic transportation. You might point out that there are alternatives, and there are, but in the US it means paying a TON for rent in order to live in one of the few nice neighbourhoods in the country.
* Most of all, not everyone is a developer. Perhaps people who make $30k a year should be able to take some time off, even for a modest vacation near home, without being in abject terror of seeing their lives ruined for it?