iserith
Magic Wordsmith
As for the DM describing PC actions. This is something I probably do more than I should. My wife, who does not play D&D, sat in on a few sessions I ran, and I remember her calling me out on it. ("You shouldn't tell them what their characters are doing.") After reading iserith's admonitions against this type of behavior in another thread, I've been trying to pay attention to it in my game.
I think it's one of those things you don't notice yourself doing until someone tells you about it or until you see it done in another game. For me, it was watching actual play podcasts. If you're anything like me, you can't un-see it so now I notice it all the time. It's maddening!