invisibility is an even better option, and it still allows healing
sometimes it's just better to be able to disarm traps before aggroing mobs. Xorian Cipher's archer hallway is a prime example.Your other three examples are one rare occurrence and two things that are only useful when soloing. That's not exactly a rousing series of powerful applications of skills.
failing move silently checks is an interesting art (thru sneak and/or invis), seems a bit better at seperating groups than body pulling (ie getting spotted), but i haven't used it too often. failing a check is hardly a validation of a skill though.
i would agree that stealth needs MORE uses (namely pickpocket).