Hussar
Legend
I still make them roll.
And monsters (some of them) can see invisible and sense movement on the ground (tremorsense). Invisible and silence is not the end all and be all of stealth.
Nevertheless - my players look for ways to help their companions and I have never had the problem of the wizard grabbing all the attention.
Actually, that's a very good point.
The only way the rogue can actually be sneaky around certain monsters is if the Wizard helps him out. Nothing a rogue can do by himself can overcome the issues you have laid out.
But a wizard? No problem. Overland flight spell negates tremorsense. Ethereal Jaunt and now I have nothing to worry about at all. Or, just send in an Arcane Eye spell and do all the scouting with none of the threat.
Even if you've never had these problems in your group, can you not agree that these problems may exist in the system?