Fair point about apps but websites are becoming more and more javascript centric.
Agree, for me most JS usage comes from things such as HN upvote arrow clicking, etc... and html5 youtube, yes.. but I think flash version was better ;)
Anyway, these are examples of content consumption - news, videos, etc...
Do you use gmail? any other webapps? Those are heavy JS, even if not 100% JS.
Nope. I use gmail exclusively as POP3/SMTP server. I can't imagine why someone would prefer using gmail web interface over some powerful desktop e-mail client (The Bat!, Thunderbird, Claws...).