I have, however, come to realize that navigation through a large project with keys alone is suboptimal. One typo in a nav command and you have to press at least four or five more keys. With the mouse, you're less likely to make such mistakes and your retry time would also be low. It'd be like trying to browse the web using the keyboard alone... even I, a hardcore vim user, found firefox/vimperator underwhelming to say the least.

What would be awesome is if they made some sort of hybrid superintelligent keyboard where the whole keyboard surface could also act as sort of a multi-touchpad. As a compromise, I've found that the thinkpad-style pointing stick in the middle of the keyboard does a fair job.

Practically, this means that whatever file you think of, you can type any part of its name at any time to get to it. Once I got used to working this way, I stopped using the project tree-view: it's just much slower.

Highly recommended, they both have a smart open file that lets you start typing a filename, and smart goto, which lets you start typing a class or method name. Makes navigation so much faster!

To some extent you'll need mouse-interaction, for dragging things and clearly visual stuff like that (nobody likes to position things with the keyboard, or at least they shouldn't), but they should really do their best to add keyboard hooks to almost everything that they can, definitely.