“We use them quite frequently, because someone or other at work is always calling meetings and the podium is where the mike is at.”
Well since grammar/terminology has entered the discussion, here are my two cents. My paternal grandmother (also a Texan) could not stand the word “at” on the end of a sentence. To her it was almost universally incorrect and unnecessary. Rarely was she asked any question constructed in such fashion (e.g., Where is it at?) without responding, “Sitting on the ‘a’ looking at the ‘t’.” or, “Behind the ‘at’.”
Today it is quite common to hear “at” used in this manner especially by the media. In many cases simply omitting “at” as the last word in a question or statement communicates the meaning just as clearly. When the “at” is preceded by a contraction, for example “it’s” or “they’re”, dropping the “at” and using the contracted words in full will convey the same meaning.
It’s funny how things from childhood take on a different light later in life.
When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years. - Mark Twain
Grammar is always a tricky subject. There is a common belief that one should not use prepositions at the ends of sentences, yet it is difficult to find that written out as a hard-and-fast rule in a grammar guide. Furthermore, the linguistic contortions one has to go through to avoid end-of-sentence prepositions are often quite convoluted.
When I was in Texas, a phrase that I sometimes heard was "might have could." It makes little sense, and it is something I have only heard from Southerners (well, those in the far south, not Marylanders). I gave up on trying to understand what the point of the redundant phrase is.