The problem I have with this concept is that if you take AoE spells away from the Wizard or Sorcerer, they don't have much left that is worth taking. So here is my Wizard or Sorcerer character talking: "Just so you know -- I will be throwing out area effects and zones EVERY SINGLE ROUND. If you don't want to get hit, don't get caught in the middle of a bunch of bad guys. Stay on the fringes until we whittle them down to a manageable number."
I know this will be controversial, but seriously, the difference in power between AoE and non-AoE spells is huge.
Counterpoint: You have a character that is based around AoE spells. Learning how to use them effectively in a group means more than simply counting enemies targetted--it also includes knowing when, and when NOT, to use that blast in that particular spot.
'It's powerful' is as much an argument -against- hitting your team as it is an argument -for- hitting your team. I -KNOW- they are powerful, that's why I do not enjoy being hit by them all the time.
But, yes, having a melee team create a shield wall that forces the enemies to gather in an easy front line is a good way to coordinate with a wizard PC. This isn't always feasible, however, Avengers and Rogues often move out of those positions to milk flanking/oath of emnity. Of course, when the enemy has an AoE, that's a different story....
Final note: No, I haven't actually done this yet. I'm speaking theoretically of what I expect to happen if I ever get a chance to play an AoE-oriented character.
Thing is... 'I have an ability' is not justification for using an ability poorly. It is one tool. You should wisely choose other tools. A wizard, for example, should probably have an AoE at-will, and would be well served with a single target at-will as well, just in case they are in a situation where AoE damage does more harm through collateral damage than good through enemy attrition.
Humans, of course, can simply go 'I'll take Fireball Lite, Shoveywave, and Cloud of Stab for the win'.
Of course, if I'm immune to the effects of that AoE, then hitting me or not hitting me is a non-issue. I'm not going to get angry that you hit me with something that cannot harm me, in this sort of genre. I'd encourage it as a tactic because I -know- it is a safe tactic to do. This is a corner case, however, and doesn't really count as hitting your own team.
CORROLARY: Resist Thunder is actually starting to look quite decent because of the above and Thunderwave.
SECOND CORROLARY: If I'm surrounded by a crap ton of minions, and I didn't open the combat with something like 'After you, Mister Wizard sir' rather than charge at unknown enemy A, then I was the tactical blunder. This is the point where charging in is dumb, as a well placed AoE is -exactly- the right diplomatic greeting for these fine ambassadors of peace.