When doing language analysis I find it useful to forget about devices in general, but really home into the connotations and word choices used by the author, and tie that back to their intention.
You'll find a lot more to write about if you look at connotations and you won't spend half the time "looking & labelling for devices"
I think if you focus
purely on connotations and word choices then you risk giving us an incomplete picture of the article. You can deal with devices without simply "looking & labelling for devices" by
analysing how they position the reader (and tieing this back to the author's intention) and by selecting the
most important devices. That isn't to say that word connotations and choices aren't good things to analyse, as a matter of fact they are often the difference between an A and an A+ essay, but you can't simply "forget about devices" as they are an integral part of the article.
Edit: That said, you are right in saying that language analysis shouldn't be approached with a 'got to catch 'em all' mentality.