Actually, they've lost a great deal more then a +1/-1 to saves in the conversion from 2nd to 3rd edition.
Let's pull out my complete wizards handbook, shall we.
Abjuration: Minimum wisdom requirement, immunity to hold spells at level 17, +1 increase in armor class at level 20.
Alteration: Minimum Dex requirement, 2 additional N.W.P. at levels 17 and 20.
Conjuration/Summoning: Minimum Con Requirement, no longer requires material components to cast conjuration and summoning spells at level 17. Level 20, instant dispel of up to 10 hit dice of summoned creatures 3 times a day.
Enchantment/Charm: Minimum Cha requirement, immunity to cham spells at level 17, At level 20 special free action once per day.
(Greater) Divinition: Minimum wisdom requirement, Level 17, immunity to all forms of scrying spells, Level 19, cast a special find traps 3x a day, Level 20 Special Divinition.
Illusion: Minimum Dex requirement, +1 additional bonus to illusions at level 17, Level 20, special dispel Illusion.
(Invocation)/Evocation: Minimum Con Requirement, +1 to save vs such spells at levels 17 and 20.
Necromancy: Minimum wisdom requirement, +1 to save at level 17, special speak with dead at level 20.
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Not even taking a look in spells and magic for this one.
There has obviously been some changes from 2nd to 3rd, mostly justified, but recently I aquired hackmaster's "Spellslinger's guide to wurld domination", and you can seriously feel the difference between the previous dnd systems and 3.0/3.5 with regard to arcane spell casting.