JunkMonkey
Lord High Vizier of Nowt
The effect that it has on us can quite easily be overstated. But there is a demonstrable effect to exposure to anything over a period of time.
Even if that effect is an aversion to whatever you are exposed to.
At the moment I am suffering a violent reaction against bloody Christmas music - or mare particularly the same fifteen or so that get endlessly repeated over every shop's PA system every year from the middle of November onward. I avoid shops that play music at this time of year. Though I did score a piddling victory against it the other day. I was in my local coffee shop "...and so this is Christmas...".
When the only other patrons left and the staff were busy out the back I went over to the CD player and turned it all the way down to 0. Then went back to my coffee, my bun, and my book.
The staff didn't notice.