After 45 minutes, my index fingers are absolutely warn out from using a trackpad. I really wish he would have made it navigable by more than just click & drag. I do wish this was more thorough, though.
I used the zoom versions after the fact primarily so I could swipe to look at the original 1:1 more comfortably, and then only later to follow up on what I thought (correctly) was just a bunch of blank space. Clicking to drag specifically really dampened my enthusiasm for going off in random directions to investigate the whole thing.