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>>3354
also, you need to consiter your audience like shit too. For instance, I'm about to start working on a web app for TOR. I most certainly won't use ANY javascript for that, mainly because the tinfoil hat audience there (rightly) disables JS by default.
Likewise, JS can be a bitch with cross browser shit. IE implements literally a different language than everyone else (JScript rather than JavaScript...still 90% ECMA though...)
Still, you ask, is it "worth it"? Well, yes. Bluntly, JS+HTML5 is where it's at today. Other than that, you can add dynamic "shit" for your users' convenience, so, unless you're coding for the deepweb, yes, JS is useful, although you need to keep it in mind as an "optional enhancement" rather than as the center of your gameplan...
2/??