But the default.aspx page is still there. If you navigate to the team site and append default.aspx to the end of the url, http://host/sites/teamsite/default.aspx, you will notice it takes you to a page very much like the previous 2007 version of SharePoint.
The feature is not activated automatically on Blank site (STS#1) or Document workspace (STS#2)
For more details about the WikiPageHomePage feature refer the following article
How to change the wiki home page programmatically: