More Creativity
On the level where there are 5 or so turrets on platforms above deadly goo-water, where you have to get a box to jump and press a button, I instead used the camera to jump up and press the button, which simplified things greatly as I didn't have to use the box trick.
Also on the companion cube level on the challenge map where the two buttons are in the back I also used a camera to boost myself.
Hopefully that made sense 
He is talking about 18 (the one with the turrets and the poison water), and 17 (the one with the Companion Cube). In the Challenge version of 17,
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On chamber 18, the one with the 4 turrets in the cube room, I never used a camera to get somewhere I shouldn't. On the other hand, I got a gold medal in time and steps for this just ignoring the turrets completely.
Just a matter of pushing the button. Running in. Placing an exit portal and jump of the right hand side to fling.
I did use camera's in the companion cube one. Though I'm not really sure what you mean by boosting yourself, I used camera's in combination with the cube to climb up the place where you exit. It's the key to getting 2 portals on the map.
-Thinking with portals
-Killing with Pyro's
-Defending with Engineers
-Healing with Medics
-baleet this-
I was glad to see it go. The damn thing told me it was gonna shank me while I slept.