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That is pretty incredible but considering the history I can see why it would be so sparsely visited.

At least they strongly promote it. https://www.bund.net/themen/gruenes-band/gruenes-band-erleben/ But on the way you see only very few signposts.

I have a feeling that pretty much everybody knows exactly where it's at but I could see how a lot of people would avoid the area due to the history and the 2.5% chance of stepping on a land mine

No, never. The most people don't know the path, they don't know the area and they don't know the fact that there were mines 30 years ago.

I would definitely not wander around without a knowledgeable escort in that case