Pallypower wont help with your Priest buffs. I use SmartBuff and bind it to the ` (Oem3) key on all accounts. Make sure you pass that key through to all windows too, you'd be surprised how often that doesn't happen. SmartBuff seems flakey with group buffs, but for your standard 30 and 10 minute buffs it works great. Just spam that ` a few times once in a blue moon or after a wipe and youre solid.

Note, unselect the 'Down' option for mousewheel buffing as your mousewheel will override your trigger key which is bound in Keybindings like everything else.