Android has a very nice, native YouTube app with a smooth interface. It can view about 50% of videos, though, since many users lock mobile users out (why?!). So opening the browser, using a development debug setting, running Flash and having awkward touch controls is quite the pain point for just wanting to see a video.
I usually use Opera Mobile, and have set the UA string to desktop, but I didn't know you could do this with the stock browser as well. Thanks, I'll try that out.
In Opera Mobile with the UA set to desktop, the experience on YouTube is suboptimal compared to a normal laptop, unfortunately.