Your experience are certainly welcome, and I think they are valid, and might be a typical experience for 1st to 2nd level characters.
But I still like to add a few comments. I think what is noticeable is that the dynamic you describe changes with levels:
1) As you point out, the Wizards attack bonus is just a few points off from the Fighters. Even though he is not doing wizardly things, he can at least be effective with his crossbow. That doesn't hold true at higher levels. (But it is yet another problem in D&D 3.x, that is not related to resource management - except of course that only a wizard out of spell resources has to care about his attack bonus with crossbows or his Quarterstaff

)
2) Your group doesn't yet rely on the D&D 3.x typical Wand of Cure Light Wounds. (It this level, they are rarely available). If you had them, the Cleric and Wizard would have been out of spells, but thanks to the Wands, everyone would have been at full hitpoints. Now, suddenly the Clerics and Wizards would be the only ones that actually need to rest.
(This certainly indicates that, maybe, Wand of Cure Light Wounds are the problem. They are certainly a critical factor here.)