I think it's a good change, and if I recall offensive dispelling is less dangerous in PF, since they got rid of area dispels and you don't automatically get a chance to dispel every spell (it's 1 spell with the normal dispel magic, 1/4 CL with greater). So even if you had a permanent darkvision spell, the dispeller would have to work through your blink, mind blank, haste, etc before getting to the permanent (low-level) buffs.
Still, besides some low level utility spells that you could just put on a scroll, the only ones that really seem worth it to me are enlarge person for tanks and maybe permanent invisibility for a character that doesn't make direct attacks (a conjurer or buffer-type).