It used to amuse me to no end imagining Microsoft collecting metrics on Internet Explorer only to discover it was only ever used once, to install Firefox (and later, Chrome). Window's "Hide Update" function was a godsend when first introduced, allowing those of us in the Western Hemisphere to mask the fact that the Uzbekistani language (among others) wasn't installed on our systems - and it seems to work really, really well.
Excepting the Bing Bar, which, despite my best efforts, will regularly "unhide" itself as an annoying reminder I'm not using it. At this point I can only assume, given what are probably terrible use statistics, rather than stop promoting the Bing Bar, they'll simply force it upon us through integration in a future release of IE. But by all means, if you're a fan of resource-sapping software bloat, circa 1996-style toolbars, bing, or targeted consumer marketing, install away!
In a related incident of cult-like propaganda, Windows 8.1 update KB2919355 (threat assessment self-identified as, "Important") moved the Windows App Store icon from its obscurity on the spammy apps page to...my taskbar. Yep. Pretty fucking important.
I promptly deleted it.