It would be nice to not HAVE to exaggerate your interest in programs that are near the bottom of your rank list, but being that anesthesiology is competitive (especially at some institutions) most residents would rather match at such programs than go unmatched. Likewise, the residency programs do the same thing. Therefore, because both parties might just end up with each other, it works in your interest to be flattering. With a match process, you never know what you're going to get.
Selection committees have created this by creating cutoff scores for your USMLE scores. Your application goes in a pile, and is just a number. So all of those fancy CVs only floral print paper, personal statements, and letters of recommendation don't even get a glance if your scores aren't deemed acceptable. Secondly, if your score is adequate, your file is scrutinized at that point. Thirdly, personal appearance is important during the interview. A candidate that is attractive (in excellent shape, etc.) will be noticed and remembered... I've seen it happen on every level (from college to fellowships). Lastly, the follow up thank you card is a waste of your money! I've found that some program directors don't even open them. Just follow up via email. At least you'll know they'll read it. Lastly, the selection committees have created a selection process that is arduous and at times impossible for most candidates. Every program seems to want an applicant that looks like Megan Fox (with Double D's), multiple clerkship honors, perfect LORs, and published in multiple journals with presentations at major scientific meetings; even if they like to state that they're really interested in "character". This is such a lie, because character only became important to the residency selection committees after cutting 3/4 of applicants just because their Step 1 score is not stellar. IMHO, some of the worst residents have had some of the best USMLE scores and can't hold a candle to at least half of their own entering classes. USMLE scores do not translate into great residents. They only indicate that you can pass a test! And that's about it. Our residency selection committees must learn to utilize more up to date rule out/in criteria besides USMLE Score Reports. I recommend using only letters of recommendation, personal statements, and curriculum vitaes to rule in during initial views of applications... Then, rule out using research interests, scores, the interview rankings, etc.