yeah, I'm definitely NOT airborne allergic, but I always request the peanut-free flight when I fly Southwest. I mean, you're in a tin can high in the sky, why risk it and cause yourself that much extra anxiety? And you get to pre-board, which you can use to pick the very best seat and wipe the hell out of it and the window and the air conditioning controls.
Plus, then they distribute snacks that you might be able to eat and are way better than paltry peanuts (if you're ok with Nabisco that is). The pretzels have a may contain, but the plane cookies are awesome. And I've even gotten oreos before.
The only sad thing is that when I fly them, I'm scared to read Skymall because of the fingers that may have already touched it.