Erm, you're missing the point. He wants to view the YouTube movie, just not the ads. Stopping all flash content is a bit useless in that respect.
I believe you missed the point of the suggestion to use flashblock.
Installing flashblock stops all flash items from being shown UNLESS you click on the item. So when you load in a youtube page you just click on the movie part of the screen to see the movie, and you can always set up an exception in the whitelist to allow only flash objects from youtube.com and not the google, etc, ads (like I have done with flashblock in SRWareIron) so you don't even have to waste a millisecond of your life actually clicking on something.
It works perfectly, and no annoying flash ads