Trust me, I get your frustration!! It's so easy to toss a candy bar or bag of chips or Coke on the counter and I can be half way done with it before I leave the store! And you are right, there is never a display of bananas or other fruit to have as impulse purchases.
It's not so bad anymore now that I have my eating schedule under control but when I have to, I will choose to go through the candy free checkouts. Supposedly they are designated for babies and children who beg and cry but it could also include me as a 3FC!