Re: You underestimate the rate of progress,
"those translations came out either near-perfect or very good (with very few glaring, easily fixable issues)."
For whatever reason google translate gets negatives (or double negatives) wrong in Dutch. So you get things like "off peak tickets may not be used after 9am or at all on weekends and public holidays".
Usually gets it perfect for stuff from the tax department. I assume it gets lots of practise on those :)