It's just anecdotal but everyone I know who play Pokémon Go has disabled AR. I used it for a few minutes until I realized that playing the game is much easier with AR disabled. Pokémon Go isn't really an "AR game". It is a mobile game which has an optional AR feature.
More anecdotes: https://www.reddit.com/r/TheSilphRoad/comments/9ic3pq/survey...