I can't believe so many people got used to scrolling up and down the party list. It felt way too button heavy and slow for me; I pretty much got rid of it as soon as I started healing ifrit hm (the first time you get a party of 8). I essentially just use a bunch of targetting macros to target everyone in my party; the downside is it takes up a lot of crossbar space. I'm sure I showed how my bars are set up in some other thread around here.

Besides that I also have a target filter for just enemies, just party members (pretty much never use this one though) and just alliance members. Oh and a "target target's target" button, pretty helpful for those 24 stuff to quickly find who's tanking the boss. Oh and I use that shortcut bar, but I have both combinations lead to the same half; that's just to make sure I never slip up and pick some random skill by accident.