I spend a lot of time browsing the web each day. I spend very little time using "web apps," and the few that I do use can easily be whitelisted, since I rarely try new ones. Everything else is basically a blog, article, some other completely static source of information, or an entirely HTML forms-based interface.

I don't block and selectively whitelist javascript, but I think I'd barely notice if I did. Maybe I'll give it a shot some time.