Does the "pause and wait" thing work reliably anymore? I get the impression YT just puts the next few minutes into the buffer at best and doesn't continue downloading until you hit play again.
Youtube is pretty much constantly changing the way their video work, so right now some videos only buffer the next x seconds, but I think they're already moving away from that, presumably into something even less convenient.
"Don't Be Evil." "Walk right up to the 'greepy line' but don't cross it." But their definition of evil and the location of the creepy line keep moving, and they don't consciously notice.