Animals won't attack or flee from you. You can walk right by a sleeping bear and he won't jump in your face. Other creatures are affected too. Walking through a cave full of spiders was spooky but they don't attack.

LOL ... I discovered this by accident early in my playthru. I'm nerdy enough that I read all the tablets on my way up but never noticed getting the blessing. After coming back down the mtn, I headed north to head back to Whiterun when a fox ran straight up to my PC and just stood there looking at me, then seeming to follow us a good 1/4 mile up the road. Later I noticed deer/elk stopped running away ... then wolves paying me no mind.
At that point I still had no idea about the blessing and it being temporary and just thought, "Wow, it's good to be the Dovahkiin!" So after going a while without being attacked by mudcrabs, bears, wolves and having deer and foxes act all friendly, I got in the habit of petting all the local wildlife while walking around. I got so lulled by the passivity that I almost jumped out of my chair when the blessing wore off and that first pack of wolves jumped in my face.
Anyway, now I know to appreciate the reward for not FT up the 7k steps, while monitoring my active effects afterwards so I know when nature starts to bite again.