Are you using Visual Studio Express edition? It is not supported with Oracle Developer Tools.
In Visual Studio, when you select "Help-->About" from the menu, do you see "Oracle Developer Tools" listed?
When you ran the installer, did you see a dialog asking you which version of VS you wanted to integrate with? If you have more than one version of VS on your machine, you must select VS2012 if you intend to use it.
When you run the installer now and look at currently installed products, do you see "Oracle Developer Tools for Visual Studio"? Does it show version 12.1?
I am using Visual Studio 2012 Professional (Update 4)...not Express.
Developer Tools are not listed in the About page.
I only have a single Visual Studio installed and there was no prompt during ODAC install to determine the version.
Running the installer does show the Oracle Developer Tools for Visual Studio in the installed products as version 184.108.40.206.2
Internal name: oracle.p2k.odt
External name: Oracle Developer Tools for Visual Studio 220.127.116.11.2