At this point, I think the biggest convenience of Bitcoin for world travelers is the ability to exchange it for any local currency.
Your post makes sense given your signature, but as more merchants accept bitcoin, converting will become an unneccessary step.
Someone from Europe stopped in a restaurant in my building that I got setuup with
Bitpay solely because it was on one of the coinmap sites.
It'll take time, but this is definitely a perfect application for bitcoin.
I certainly look for anywhere that accepts bitcoin every time I travel.