Plane Sailing said:
You're kidding, right?
No, we are talking at high levels of play. Most of the listed spells are duplicates of magic items and real high level characters have the items and don't need the spells. Otherwise the modifier only affects one character and if that player cannot handle his own spell effects, get him some index cards:
bless: I don't think our 23rd level cleric has ever had the time to cast bless after all the other spells he's had to cast. So instead of my list being prayer and haste, throw in bless. Not that long a list.
divine favour: only affects the caster.
bardic music: Never seen a 3.x bard in play. Still, it is no different than prayer or haste (but probably doesn't stack with bless

)
GMW: Doesn't stack with magic weapon
magic circle against evil: Deflection bonus doesn't stack with Ring of Protection, resistance bonus to saves does not stack with cloak of resistance. This spell is only used for its protection (100%) against enchantments.
rage: only affect the barbarian, see above for how our barb handles it
cleric armour enhancing wotsit whose name I forget: again, won't stack with actual magic armor.
funky prestige class abilities: uh huh. No matter how bizarre these may be, they happen every combat probably and you should be use to them if the character has been with the party for the last 10+ levels.
not to mention concealment/displacement/blur/blink/invisibility: Most opponents at high level play can see through invisibility or even have true seeing, there are epic feats to negate miss chances and none of these things stack. Only the best one matters.
assorted dodge bonuses: dodge bonuses always stack. Pile them on without fear
fighting defensively with or without tumble, combat expertise, power attack: All of these are done by the player for his character. Throw in charge while you are at it. It only affects that character, his player should deal with it.
Sure, most of these things first turn up at low level... but at high levels you tend to get all of them at once, which can lead to PC/DM overload.
Hasn't been a problem in our 28th level campaign.