I think its a bit snobby to say travelling makes you a better person. Obviously it gives you experiences and expands ones own knowledge in a more practical way than maybe reading or watching a documentary.
But for lots of people cost will be a prohibiting factor, on MN there are always people who claim going abroad is cheaper than staying in the UK or someone who trekked in the himalayas for 10 days for £150. But in real life even doing a very basic holiday abroad (backpacking, staying in hostels etc) is still going to involve flights, potentially visas, sometimes tourist taxes, spending money once you get there etc, its not something everyone can afford, or they might prioritise their spending elsewhere.
Ive probably been to about 14 countries, all in Europe or Africa, on a mixture of holidays (camping, villas, hotels, hostels, trekking, safari etc) , DH is far more well travelled - he did most of his travelling before we were together, and has been to all the continents and more off the beaten track.
Do I think hes a better person than me, because of that? No, he is more well travelled, and possibly better at geography, that is just one aspect of him as a person.