I have to say I probably only noticed it because I was expecting a trick (cynical git that I am) and what I actually noticed first was an increase in black "shirts" THEN "Oh look one is a gorilla". I then called my daughter in, she's 4, explained we were going to do some counting, 1, 2, 3, 4, 5, 6 monkey end of counting and start of giggling.
So! so far while Twister, my daughter and I all noticed the Gorilla, none of us managed to count the passes. Top of the class for being observant but bottom for completing the task at hand.
So it's not ALL a reversal
It makes an interseting case over road furniture, 90% may not notice it but of the 10% that do a proportion (so far 100%) have indeed had their concentration removed from the road.