The mess is that they had to be dealt with on a spell-by-spell basis in the first place. Why does every spell need to have individualized disruption parameters? Resilient sphere is not resilient to most disruptive magics, but other effects are. It's a hodgepodge that you really can't expect a DM to memorize.I can't say the one's listed in the entry you gave were too hard to deal with (certainly not what I would label a "mess").
We'll have to agree to disagree. I don't think the game should require DMs to memorize all the spell effects to be an effective DM. He should be free to concentrate on important things like crafting a story, developing engaging NPCs, and devising challenging encounters. Memorizing minutia to avoid having to cross-reference rulebooks in the midst of an encounter? That seems like a recipe for slowdowns.Personally i feel stuff like this does present a challenge because the GM has to know the spells his monster can use but 1) i think the effort is worth the richness it brings to play and 2) the gm really should learn spell effect anyways, and monster encounter prep is a great place to start.
It's a barrier to entry, and it's a pretty high one.