Yes Yes Yes.
I travel to the U.S a lot and I've done two trips outside of North America and I purchased travel insurance everytime... Even just for a weekend trip to NYC, I make sure I have travel insurance... When travelling in my own country, I'm covered through work, but anytime I leave Canada for an extended time, I don't leave without travel insurance... Which I always purchase through my bank. Thankfully, I've never had to use it, but I just know, if I chose to go without it once, that would be the time when I would need it... Murphy's law, I suppose.