I don't go on youtube much lately, but yesterday was checking out some trailers and breakdowns of trailers, and everything I was clicking on was now held up by advertising of up to 3 minutes. It's gotten so bad that they don't even give you the option to skip the advertisement or fast-forward it.
Obviously my version of adblocker doesn't block youtube commercials (and they probably re-work their coding to block those add-ons, who then have to update their coding to get around the youtube updates - kinda like a video capture program I use, which keeps needing to update itself when youtube finds a way to block it).... however, I think I stumbled on a way around the compulsory commercials at the beginning of the youtube videos - click on the next video tab at the bottom left of the video screen, and then click your browser's back button, and youtube thinks you already watched the commercial, and starts playing the actual video.