This game isn't hard enough to need pre-buffing (playing Path of the Damned). If you spend one or two cycles on a buff for a "difficult fight" then you're golden esp with how long some of the buffs last. My issue is it's hard to tell who's idling.
In BG it made a difference to buff. Honestly, I was just buffed all the time. There wasn't much "thinking" to it. It was just "always keep spells X,Y,Z up and summons for bigger fights". So, BG wasn't more "tactical" it was just easier to max out pre-fight... and honestly, sort of a hassle in comparison. I don't bother with buffs most of the time and I'm sort of happy I don't need them.