Do I like Flash? No. Is it a necessary component in today's web experience? Sadly, yes.
Gee, I dunno. I use ClicktoFlash in Safari and the built-in Flash blocker in Camino. Yes, I sometimes do invoke Flash content when I can't get information I want in some other fashion, but I'd no more call it "a necessary component in today's web experience" than I'd call corn-fattened beef a necessary component in today's gastronomic experience. Ubiquity != necessity.
And CSS and Javascript cannot replace Flash. The bit of HTML5 that will do so is the <video> tag.
Well, I was thinking also of sites whose
navigation is Flash-based; CSS and JavaScript do, in fact, offer alternative means to a similar end there.