I wear perfume everyday and I have a handful to pick from, then I have another selection of 'special occasion' scents too, plus a few others for different seasons - Estée Lauder Bronze Goddess for example is a great summer scent, but I won't wear it in Winter. I'm not the only one with this system though, am I?
Most recently, I used to wear Emporio Armani Diamonds Rose everyday, before that I would use Paco Rabanne Lady Million (which funnily enough, I've now reverted back to - this is bottle number 4 I think!) Now I don't really think about which one I spray on a daily basis, I just grab one and go but if I've worn something different and I've had a day that's stood out (whether good or bad) that memory will linger with that scent. Kinda sounds a bit silly, perhaps but it's true.