Grout is Much More Time-Intensive than I Thought

I am wiped out from a night of grouting. And I didn't even get that far! The wall with the faucets has been grouted, but that's it. Here's the side-by-side comparison between two walls.

And here's a closeup of the accent tiles, half of which had been cleaned at this point.

One good lesson I've learned out of all of this: grout is the great equalizer. White tile + white grout = invisible errors.