I'm using bunch of them and most of standard ones, from Mail, Weather, News, Maps to Photos, messaging etc. Also few games as well as Skype, VLC APP etc.
I set up a new user 2 weeks ago, I just realized reading this post I haven't even bothered to edit my start menu choices, I only use the menu itself for the application listing... so no, I don't use many of the apps and as I am using a local user, I haven't looked in the store at all