I always find that "only amateurs use light gear" argument a bit weak. By that standard we'd all be walking around busy markets and climbing mountains with our 8x10 field camera. But we don't.
Personally, I'd rather have a small discreet camera that takes high quality images and actually have it on me at all times (and not have everyone nearby look at me when I pull it out) than to have my full DSLR kit bogging me down all the time.
There are ALOT of options in the mirrorless realm that approach "perfect" for travel. The Fuji Xe2 would be a great example. Even the full range of lenses wouldn't take up alot of space in your bag.
Good times indeed.
To be fair, I never used the phrase "only amateurs use light gear." In fact, I stated that it's entirely possible for anyone to travel light, but difficult to do so for someone who is accustomed on a regular basis to using a high-quality camera body with an arsenal of high-quality lenses in various focal lengths to compose their images. I can't imagine an avid photographer with tons of professional lenses, waiting for years, saving their money for the ultimate excursion trip to Kilimanjaro or an African safari, only to travel with a P&S. Now, I've travelled to Disney and many other vacation destinations with a small P&S and have been very happy travelling light.
I've also seen however, tourists at the great pyramids in Egypt with small P&S cameras. I guarantee you the vast majority of those tourists with P&S cameras are not avid photographers with tons of professional gear back home. There may be a few here and there, but most avid photographers that visit one of the wonders of the world are going to want their best gear with them to capture that image. If they didn't bring it, I'm willing to bet there's a time when they regret not bringing it.