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I'm going to just pluck this out of the air and say "been to more than three other countries" is well travelled - for someone in the first world that's not difficult and is an important thing to do for broadening the mind. Some people might say that's a low bar, but there are enough that would say it's too high as well which makes me think it's probably about right.
I'm not sure if that would be considered well travelled from a European perspective. For example if you live in the Netherlands, you could drive to Germany, Belgium, Luxembourg and France all within 3-5 hours. A quick Google says the average European visits 8 countries within their lifetime. Geographical proximity and culturally dissimilarity definitely need to be considered.
Also exposure to the country. Just driving through it (or sitting in an all-exclusive resort for that matter) is not what I consider travelling/exploring.