Too much ado about something

Is there such a thing as too much of a good thing?  The phrase has appeared in both country music and Shakespeare, which is probably pretty rare (though one can imagine singing the words "as you like it,"  "all's well that ends well,"or "exit, pursued by a bear" with a harmonica and a washboard), so its likely true.  One way to test the question more scientifically would be to write this column more frequently, but that would be, with characteristic modesty, more of a truly great thing.