I work at Walt Disney World in the Magic Kingdom. My store is at the exit of the Hall of Presidents and the fireworks are launched every night from behind our location. It sounds like the bombing of London in our store and we have to warn parents that if their children are frightened by loud noises, our store is not the best place to be during the fireworks. And when the finale goes off, yes, the windows shake and when I'm upstairs in the office I can feel the building shake. Even during the solitary fireworks following Cinderellabration, which occurs every hour, the guests in our store just about jump out of their skin when they go off. I frequently warn people near my counter to expect the explosion. (I can tell when it's about to happen by the music.)
I'm also 1.8 miles south of SeaWorld, and the nights I'm home, I can hear their fireworks go off every night exactly at nine o'clock. Can't feel them, though.
However, one may never know how far the rockets were heard from Titanic - there was nobody there to hear them except the folks on the Californian, and they didn't hear them (as far as I know) - but only saw them from their binoculars.
Kyrila