What I think amazing about this picture is:
1) We can build a telescope to take the picture in the first place
2) We know things like the speed of light, the age of stars etc.
3) The fact that I can view the picture on the internet using a computer
4) That as well as being pretty a picture can mean different things to different people.
The fact that space is big doesn't impress me as much as the above, which is why we matter.
Though I wonder if mankind will ever look back at us now and laugh at us for being naieve or simple minded like people think of those who said the world was flat and at the centre of the universe...
As I've mentioned above I think technological progress has been amazing. The points you mention, as well as being scientific, were more philosophical and religious at the time. And when you ask those sorts of questions about life, its meaning, the way it should be lived, who's in charge etc. I don't think we've really made much progress in the last 2000 years. I find that kind of humbling.