Oddly enough, I noticed it while sitting with my feet in a somewhat awkward resting position under my desk that would normally have just pushed my toes back until the resistance from the sole balanced out my weight.

Rather than just being pushed all the way back my toes were supporting the weight of my legs. Then, I paid more attention to how I was walking and realized I was engaging my toes quite a bit more than normal.

Part of it is distributing more weight across all my toes, rather than just my big toes.