"Though exhilarating, the need to make good time in the shallow water prevented us from exploring beyond the main channel."
I call bullsh*t on this comment.
I've done the canyon from Escalante to Fence, and I know EXACTLY why you never left the raft: You're mesmerized. As the canyon walls slip past, you see a crack, an opening, and it towers above you and deep into the rock, and you literally don't breath for several seconds as you glide through, feeling tiny and awed, and by the time you snap the trance and think, "WOW! I WANT TO EXPLORE THAT!," you're on around the bend and entering the next twsit in your adventure ...
Lost most of my T-shirt to the A*shole Trees (as I called 'em. 'Russian Olives,' they say). 8<)