If it is going to be an annoying animation that is getting in the way of getting things done, I will skip it or the site, no matter what it is built in.

Frankly, I don't miss the Flash animations - 30 seconds of nonsense I have to click through before I get to see the real deal. Thank god for FlashBlock. Now I wonder if this will make folks say "ah, so you have flashblock, eh ? how about this ? html5 animations ftw...". Hopefully this will be put to more good use.