Wah is probably the pedal I use most often, more often than my fuzz pedal, actually. I often use it to make fills stand out more. Sometimes I use it to make almost a manual flanger sound when also using fuzz.
After that is probably reverb, which I use when I play with an e-bow, and also at the ends of songs or during some parts when I'm just holding a note or a double-stop.
I use my EHX Ravish Sitar pedal pretty often, mostly for the intro of a couple songs and this high up part in another when I'm also using reverb and wah.
The only pedal I don't use often is the Korg Miku. I will find a purpose for it eventually. It's just too ridiculous not to.