Correct. Just hop any Northeast Corridor or North Jersey Coast Line train out of New York Penn Station, which is 1 block away from the arena. DO NOT take a Morris & Essex Line (Midtown Direct) trains as those stop at Newark Broad Street Station on the other side of downtown, a healthy 20 minute walk away.
And when you get to Newark Penn, go to the main concourse and look for the escalaters to the Gateway Plaza, near the McDonalds.
You can walk the entire length of the enclosed Gateway which crosses over Route 21and lets you off about a block away from The Rock on Mulberry Street.
If anyone's driving, no reason to pay $30 in the lots next to The Rock.
Drive to one of the lots on Mulberry St, near Cottage/Elm which are around $15.
I have either parked there or for free on side roads off Mulberry since 2007 with not one issue. But, like in any city, it's probably a good idea to pay a few bucks in a lot.
And park on the side of Broad St near The Rock, not on the other side which is usually fine but is a little dicey at times.
For the drinkers, there are 4 bars right next to The Rock's box office on Edison Place.
Dinosaur BBQ, Edison Ale House, Loft 47 and Brick City Bar & Grill.
Start a Rangers suck chant and you're bound to get free drinks.