It's the same benefit as not getting camera surveilled all the time.
Especially with google. The combination of what you've googled, on what sites with doubleclick you've been, parts of your youtube history, etc., gives google a nice overview over all your life.
If you don't mind, then fine.
Javascript is a critical part of the modern web.
Your argument works pretty much exactly the same for images.
Sure, you can block images by default, and only selectively enable them one site at a time, but it's a pain in the ass.
Never had a problem with that.
You normally visit a couple of sites regularly, and there the necessary JS is activated.
And for most of the rest, you can navigate/use them pretty good without, at least from my experience.
Privacy here:
FF with Noscript/Adblock, DNT, no browser history, only whitelisted cookies.
No FB, no Twitter, no LinkedIn.
Basically no images of me connected with my name online (there are a few on some friends FB, but without my name; some from the GamesCom 2010, but only with my forum name).
My real name is basically nowhere online, besides on the websites of my current and my former university (and sadly from my email address on some public mailing lists, from which I get spam from).
Bad habits: I use google search, translate + maps, and I have an Amazon account.
Else I can't think of anything.