Magical workshop/saved posts
Private workshops are best, but are only of benefit to their owners and useless to anyone else (i.e. not a workshop for non-owners.)
Guild and CHE workshops are the next best, and are equally great.
Public workshops are least great, but still great.
The sense messaging for mana pool stuff is a relic of the old enchanting system, and actually doesn't mean anything anymore in terms of Enchanting or anything else.
The presence of a mana pool DOES, however, indicate that a room is an enchanting workshop.
I'm immune to fire!
Now with more banhammer!