It's awesome to think of all the subs individually, but I can understand how the big guys forget.
I'm not a big channel by any means, but I have about 38k. Now I can't picture them all individually. the biggest place I've ever been to had 5k people in there, so I can picture that. But like you said, when you go to the analytics and see all these different countries, and ages, it really wakes you up.
I've actually met a little boy around 6 that said he loved my cartoon series. and it nearly made me cry, so awesome!