Mountain Lion's Spotlight didn't Spot Application

Maybe it's just me, after upgrading from leopard to snowleopard to lion and finally mountain lion (always upgrade, no fresh install), this big cat suddenly refuse to index my Application. Whenever I type application name in Spotlight, it just show document, picture but not Application. Typing "macvim" bring me to macvim installation folder, macvim on the web but not Macvim apps. Spotlight setting clearly didn't ban Application folder, so maybe this is another Mountain Lion problem

Still looking for solution...