The lack of a proper (read: simple, fast, non-java) IDE for Ruby and Rails projects is something I still miss when using Vim. Specially when I need to work on a legacy project, I would love to have a better way of navigating through the methods and classes.
Recently I found an old but very efficient way of doing that using vim and ctags. The following is a simple screencast where I show how to use ctags to solve that type of problems.
Vim + ctags demo from Ruben Fonseca on Vimeo.