I used to be a huge fan of Intelli-J and there is a fantastic VI plugin for Idea. Now I'm shifting to the Spring Source Tool Suite for my primary IDE and need to find a VI plugin that will allow me to work just as effectively.
What plugin are people using?
I'm a bit late to this thread - but I wanted to throw in a vote for Vrapper. I used to work with the WindRiver Workbench IDE and I got used to the "Vim layer" it came with. WRW would push a Vim toggle button into the toolbar which allowed the user to activate/deactivate almost all standard Vim key bindings.
When I moved back to vanilla Eclipse I spent quite a bit of time trying to find this same feature and eventually concluded that WindRiver wrote the feature from scratch because it didn't seem to exist. Today I found Vrapper, which pushes a very similar toggle switch into my Eclipse toolbar and seems to have a fairly complete set of Vim key bindings as well. Two nice things: (1) Vrapper can also be activated with a key stroke as with any other Eclipse feature, (2) Vrapper does not deactivate the contextual help that pops up during hover actions.