"Want to skip half the mobs while questing to get to the good stuff? Stealth."
... and hope vanish doesn't fail spontaneously...

"Your raid about to wipe and you're too cheap to pay your own repairs? Stealth."
Lol. Nope. Boss comes over and thwacks you whether you're vanished or stealthed.

"What to pick your own battle whenever you want, wherever you are? Stealth."
True enough, because if you don't - you'll find your lifespan is very short.

"Your team are a bunch of losers in PvP and you just want to chill out until the end of the battle? Stealth."
Oh come on, really? You are bitter.

"Stun locked a clothie to half health and want to finish them off while they fat finger their PvP trinket so that you can blind/gouge into another stun lock and have the other guy toss their keyboard out the window and smash half a dozen mice? Stealth..."
Every time I hear someone complain about stun locking I think about the 5 minutes I've spent chasing a mage around an arena unable to touch him. Every class has annoying abilities.

Roll a rogue, educate yourself.