Good buff but I meant something different. How many buffs would you'd throw on if 1) combats started, 2) you're (somehow) unbuffed and, 3)its a no DMM game.
In those circumstance, I'd throw on magic vestment, and move into combat as a flank. Next round beat the concentration DC to cast without provoking AoO and either finish the fight with the right spell or buff up with Divine Power and show the beatstick how its done.
Well that depends both on my level and my build. Since there is close to no reason not to take a load of PrCs as cleric, I would probably not be a single classed cleric at higher levels. And as soon as you get prestige paladin you'll get full weapon training even though you just started as a wimpy cloistered cleric.
And, a cloistered cleric can basically have knowledge devotion for free, which is at least +1 on attack and damage rolls, which means a level 1 cloistered cleric with a war domain fights pretty much as well as a level 1 fighter.
If I had no rounds to pre-buff (which rarely comes up, even a lesser rod of extend means that even at low levels buffs like greater magic weapon can last all day), I would probably not buff in combat but just summon, or I could throw on Divine power, and I wouldn't need much more (I probably have a sick AC already, because that's what clerics do).
The worse thing is the druid, who still without natural spell can be quite decent. It is the best feat for druids atm, but there really aren't many good feats for druids IMO. Not at the low levels anyway. It's mainly natural spell, and greenbound summoning. Not much else. Now he can't cast spells while wild-shaped, so what? His wild shape still gives him stats that fighters can only dream of, and his animal companion is still laying down heaps of damage. And he can summon if he doesn't wish to wild shape. With greenbound summoning, those summons beat most level appropriate encounters by themselves. (A greenbound crocodile has a strength of 25, and a DR of 10/Magic and Slashing, as well as a total of +13 to grapple, the druid can summon this funky cousin on level 3, please point me to anything that can beat this that is CR3, and it gets worse if you look at the monstrosity that is the greenbound wolf at first level, luckily it only exists for one round, but that's long enough for the wolf to trip anything you want it to).
I think the idea of buffing the other classes is better, but you'd have to re-write them entirely, or re-write the entire system, which is sorta like a long job.