It's actually not. I assume you're talking about the rear UFO area? There's kind of a secret to it. You run through the first gap, then cut to the left, then just hug the wall and keep pressing forward. You will slow way down but as long as you don't let up on the joystick, the game will push you through. Just keep pointing towards the wall (and forward, always forward) until you're past the boxes, then use the lines on the floor to line yourself up to make a run for the door in the center, where the pillar of light awaits.
I think I've died a total of 3 times (mostly just for stupid reasons, like jumping) and I've played the level over 10 times. It also helps if you don't enter this area at the same time as someone else, because you'll both appear and it will just confuse you if you haven't locked down your route yet. Hope this helps you (I hate that part too--even though I usually get through it ok).