Things I miss: most YouTube videos are Flash-based (although often if you find them embedded on a page, YouTube will provide an HTML5 version on the fly). HTML5 playback in addition is smoother than FLV videos ever were. There are fewer glitches, slowdowns, jitters and so forth.

via Six months without Adobe Flash, and I feel fine » Houston 2600 — Computer security, hacking, coding and mayhem.

Interesting read.  I went without Flash for awhile a few years ago on when 64 bit was new on the linux box because I couldn’t get it to work and it became too much of a PITA and a waste of time to figure out.  I hardly ever use YouTube however.