Imagine every interaction you have with a human being ends will you getting a glimpse of their life and history.

That only happens to Fordola because her fake Echo is fucky. According to both Krile and Minfilia, the Echo manifests slightly differently for everyone. I believe the only things that all instances have in common are the visions (with varying frequency and intensity), the accompanying headaches, and the ability to understand someone's true meaning and intention.

What I'm more interested in is that last one. The fact that you'd be able to understand every language ever spoken. Imagine the secrets you'd be able to pick up just from, say, quietly mingling at a social event.

Though, realistically I'd probably just use it to catch people talking shit about me in another language thinking they can get away with it.