Started this thread a long time ago...nice to see other responses. Here's an updated one....and easier to see with an image! Should have done this with the first post. Only disadvantage of this method is inability to see tiny countries - like Qatar or Bahrain, very well.

Made with this:
https://www.amcharts.com/visited_countries/index.php#

Though if you find one with more granular definitions...use that. NomadMania and MTP can make more detailed ones...but would have to have separate accounts - no bueno. Though maybe some temporary way to do it with MTP? Otherwise...Google Earth with pins could work. That would be more accurate. Maybe I do that someday. Though not sure if you can make it flat. After all, can't post a globe. But maybe two globe images?

For instance - Brazil is shaded on my map, but I only drove on Florianopolis / Santa Catarina island. So...barely nothing. In contrast to Australia, where I've now driven all over SW Australia, Tasmania, and NSW, and South QL, and along coast of Victoria, and a little around Darwin. So very good coverage.

Since that first post -- added Malaysia (Mainland), Japan (Kyushu and Western Honshu), Turkey, and did drive in Argentina, Chile & Uruguay. Maybe a couple of others. For some countries - drove there before, but went to many new places. Increased coverage.