I agree, Gus. Sometimes I mirror if I think of it, but more often than not I don't. If you happen to be following one of "that quilt's" tutes and she suggests that you mirror the pattern, it's helpful if you do because it's easier to follow her photos. If you're printing from the software, just click "mirror" on the options and it does the work for you.
And, p.s. Gus, don't you hate it when life gets in the way of quilting? I do!