Using a torque wrench for some things is more important than others, but it's generally a good idea to use one if the manual calls for a specific torque setting. Just make sure you buy a GOOD one, a torque wrench is definitely not a tool you want to go cheap on. I'd be willing to bet money there are almost as many people who have broken bolts using a cheap torque wrench as there are people who weren't using one at all.
I have to admit, when I first read the post I was skeptical but after watching the video it really does seem safer than using a spring compressor, easier too. When I did mine one of the most difficult parts was getting the spring/shock assembly back into place, so using this method would have saved me a decent amount of effort and time. Thanks for posting.