I get your point (I thought of it too), but I don't think you have to be either an e or a p type to do a lot of travelling. If he was experiencing a lot of existential discomfort from staying where he was (I can imagine an INFJ doing so) or didn't have too many other positive options in his life, it could be due to that, rather than the sheer lust for adventure that would be more typical of an E**P type. This being so, I would be interested to see if anyone knows what actually motivated him to travel so much, and if there are any INFJ's posting who have found travelling to be a necessary part of their self development!
If you read much else that he wrote or about him he speaks of a pure lust for seeing the world and adventure- not an existential discomfort.
George Orwell seems like a MUCH more likely candidate for INFJness any day
Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom? -Terry Pratchett
Bleh, Joseph Conrad. Probably INFJ. Definitely annoying writer.
"I can never be what I ought to be until you are what you ought to be. You can never be what you ought to be until I am what I ought to be. This is the interrelated structure of reality." -Martin Luther King, Jr.