"Surely most people have an adblock running for Youtube these days any way?"
no 'ad block' per se, but a possible alternative method:
a) special non-priv login for youtube browsing
b) minimal plugins to avoid security and content view problems [but include movie downloaders, etc.]
c) download before you view [so you can skip things and/or get non-stuttery content with limited bandwidth]
d) make sure the browser CLEARS EVERYTHING (i.e. history, cache, cookies) when you close it.
e) always view anonymously (no logins)
f) NEVER use a flash plugin
yeah, works ok for me.