I myself wouldn't say I'm wildly well travelled. Outside of the UK I've visited France a few times, Austria, and California. For all those occasions, excluding maybe California, I was perhaps a bit too young to actually appreciate that fact that I was somewhere else in the world. I'll be heading out to Canada for 3 weeks later this summer visiting Vancouver, Jasper, Kelowna, Edmonton, and Banff. That'll be my first time abroad for about 5/6 years, so I'm really excited for it.
I do however think the sentiment of that quote can apply to something I'm reasonably experienced in, and that's art. For me, trying to create unique pieces of music is about seeing seeing unique patterns and themes within the sounds and styles already around me, rather than explicitly trying to create or seek a new 'landscape'. I think that through that endeavour, you can bring new life to known 'landscapes'.
On other hand, I don't think the you can be as black and white as the quote makes out. Experiencing new places can indeed unlock your perspective in ways you might not have imagined. Sometimes you need that external voyage to click into place before you can delve deeper into your own subjective existence. They inform one another.