I've done the "all planet search" thing a few times, this thread from back in 2006 details my first attempt at bagging a bunch of them in one night:
http://www.iceinspace.com.au/forum/s...ad.php?t=11396
and if scroll down this page ...
http://www.iceinspace.com.au/forum/s...t=24394&page=4
you'll find 2 of my posts with some info regarding one of my successful sessions in viewing all 9 planets - yes 9, in my opinion the challenge in viewing Pluto is about equal to almost the rest of the planets combined, and without Pluto included it's a much softer task.
(I don't use a GOTO scope either, but on some occasions have used my Argo Navis on the dob to home in on Pluto's location. You still have to work out however WHICH of those tiny mag 13 specks is Pluto, and which are just very faint stars.)
Planet hunting is fun, next you should try asteroid hunting, I think I viewed 6 in succession one night. It's a fun and different kind of viewing to the norm.
Cheers!
Steve