That is a major part of what being a GM/DM is all about - regardless of edition or even game. Making sure that if the PCs dawdle along, adventuring for 15 minutes a day then the bad guys will put in a full days hard work being evil - doing things while the PCs nap. Even more annoying for the PCs is to find out that they aren't the only good guys, and someone else beat them to the punch, and are being lauded as heroes.If the DM controls the pacing of the game (IOW, when the party gets to rest and recover resources) rather than letting the casters' players determine pacing, the true balance between the classes becomes much more obvious.
Casters don't dictate the pace of the game. As the DM, I dictate the game's pace.
You know, in the group I've played with for the past decade, I can not recall a single argument ever.you almost always end up with an argument.
More or less true. But a system in which the outcomes are largely predestined is exactly the opposite of what I find fun.And due to the swinginess of 3.5/Pathfinder combat, you can't accurately predict if that EL 12 encounter is going to do no damage to anyone in the group or if it is going to use up half their spells. Or both.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.