To me, it means something from a player perspective. The individual guys on the team feel confident that they can beat a team they've already beaten, and might be a bit more disheartened against a team they've lost to twice.
Definitely a good bit of it is coaching, I'll agree with that (evidenced by the drastic turnaround a few years back when Rivera actually started taking a few risks, as well as our trouble closing out games when Shula goes super conservative on offense late). I trust Rivera and oddly enough, I trust Wilks (or more, I trust that he picked up enough from McDermott before he jumped to the Bills). I don't trust Shula for pretty much anything.
I'll give you that the Vikings are probably one of the favorites - I'd put more stock in home field for them if it was a weather-based home field (Lambeau etc) rather than a dome. Crowd noise is a factor, but for me, weather is a bigger one and a dome cuts that out. The Rams have been impressive in the regular season but I just can't shake the feeling they won't go farther than the 2nd round at best. I have no play-based evidence to support that, just what my gut tells me.
South teams will cannibalize each other over the upcoming weeks, and in fact with Atl facing both the other two good ones, it could potentially take them out of the playoffs entirely - interesting scenario would be if Panthers beat Atl and Saints lose to Atl, then assuming both take care of the spare game against the Bucs, Panthers actually win the division. To the extent that playoff experience does anything, Panthers (and Atl if they make it) have more in recent memory than Saints, and all the South teams have it over the Vikings and Rams.
One way or the other, NFC playoffs will be more interesting and with bigger teams across the board than AFC playoffs though