Intellisense in SQL Server stopped working for me when I isntalled Visual Studio 2010.
David Haney has a write-up here about it.
http://www.haneycodes.net/visual-studio-2012-intellisense-not-working-solved/"> http://www.haneycodes.net/visual-studio-2012-intellisense-not-working-solved/
I just got used to not having it. It sometimes seems to get in the way.
Intellisense still works in VS 2010 but not SQL Server.
Tom