Simply due to the over-telling that is so common with beginning writing, I don't think that the Show Don't Tell guideline is overused.
I slightly disagree on this because of one point, and I speak from personal experience. Show-don't-tell can be very damaging to a young writer if they're not ready to comprehend what it really means, so they don't know when to stop themselves from overdoing it.
This was me. I wrote pages and pages of absolute vagueness thinking I was doing the right thing but I wasn't. Nothing made sense because it had no context, because I couldn't just tell someone the context of something or anything. The reader had to figure it out for themselves. There were times where I stopped to think of a way to show the color blue or that something was round. I couldn't just tell the reader. Yes, it got pretty absurde. IMHO I would have been better off not hearing of the concept until much later. Sure I was mostly telling in my early writing but compared to my over showing, at least it made sense.
I've since shown some of my 'telling' writing to someone and they made the comment that the prose had honesty in it compared to some of my later over thought out over written and rewritten stuff. They said they could connect with the telling prose.
I used to think that big over showing frak up was unique to myself, but I've found out it's not. I've seen instances of it in every writing class I've taken and every writing group I've been in.
My two cents.