Maybe EP isn't necessarily "dangerous" but it is certainly obnoxious to walk along, because these lovely footpaths along the center islands often don't have traffic controls at the intersections. So if you are on one of the center islands at Rogers, say, and want to continue along the footpath along the other side, a car making a turn from what feels like almost any direction could come and want to occupy your space at any moment. There are a couple places where the southern islands have official crosswalks, but generally the uncontrolled intersection is an annoyance on every block. That, combined with the noise and exhaust from the cars speeding along EP, makes me prefer to use Lincoln Pl or Union when I need to travel E/W for any distance.
And yes yes yes you must be vigilant and pay attention when crossing streets anywhere in NYC, yada yada, but the situation along EP, which is trying to be a nice promenade, is particularly annoying.