I think I found a link on reddit at some point, or watched vihart's video on the topic, and read the manifesto. Yeah, it made it much easier to learn, especially radians, as it makes more intuitive sense (in physics I convert to tau mentally to figure out path lengths in wavelength/period. Obviously this is just a factor of two, but I think in terms of tau rather than pi, if that makes sense.) I've never heard it mentioned in an actual lesson though, which is something of a shame, as I think the concept is pretty helpful.