The gap IS a problem. I'm fully aware of the gap, but it is not always so easy to step over it. I have a minor lingering disability from having broken my back and pelvis in a car accident 4 years ago. Sometimes the gap is over a foot wide, and it's hard for me to negotiate, especially while carrying a bag, a folded stroller and holding the hand of my 3-year-old.
I can read, and I'm not stupid, but I have lost my footing trying to get across the gap, and so has my son who has been left dangling over the gap, suspended by one arm, my heart racing as I desperately drop my belongings and pull him to safety.
I just moved to LI from Brooklyn. I've riden the NYC subways for years. I've never had such a problem getting on and off the train before.
The gap sucks!
Ask for assistance if it's a continued issue for you and you know it in advance BEFORE boarding.