I actually do not have a major issue with the Rangers suck chant in general (though the Flyers swallow and Crosby watch parts are silly). My issue is that I hear it now 5 times a period which is more than how many times I hear LGD chant during the entire game.
Might stem from the fact that the team is more boring than watching paint dry these past few years. I think some of the juvenile stuff stems from people finding ways to entertain themselves during the game.
The arena was generally loud when I went during each round of the 2012 playoffs. There were lulls, especially when the Devils had blown a lead.. but overall I think it was a great fan experience. And I don't recall a stupid amount of RS's or similar stuff.
I'm not saying I'd start a "Rangers Suck" chant during a game (I can't do the whistle loud enough) - but that's at least a "fun" chant for some people. And while I agree that hearing it five times in one game is excessive, it might be a highlight for someone who went to see "Devils hockey" loss.