Strictly speaking, Intellisense is not available for (g) Vim 7+. This is a Microsoft trademark of Visual Studio.
Automatic, context-sensitive code completion for many languages is a feature of Vim. He called Omni complete. Ruby, Perl, Java, and C ++ have plugins that support full completion.
, , , . Vim :help compl-omni. Ruby omni Vim Ruby.
, , Ctrl-x Ctrl-O. AcpComplPop, . vim.org , .