I have a love hate relationship with vim. It's super fast and efficient to edit huge quantities of text, but as a tool to really understand a code base? IDEs reign supreme. This is coming from someone who steadfastly refused to use an ide until his last year of college, and then switched, being able to see call hierarchies, having smart completion, etc made my life much easier. I still fall back to the term and vim if I need something quick and dirty.