[bp]

Vi. The simplicity, speed, and the fact that it is installed on any *nix system by default are my favorite aspects of Vi. I've played around with Vim, but haven't migrated to it because I just don't use the features.

At times, I have been tempted to move to Emacs due to all its cool features but have not yet, maybe some day. Emacs in slime mode has been great to use while learning lisp.

[palish]

Petsonally, I can't imagine being without "zz" to center my view. I don't know if Vi has an equivalent. "zb" and "zt" are nice, too.

[bp]

I use Ctrl-U and Ctrl-D to reposition the screen with respect to the cursor, and it works out great.

I can see how what you describe 'zz' doing would be nice though.