[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.