My pedal board has tuner, octave, chorus, tremolo, 2x dirtboxes (1 set to 'stun', the other set to 'obliterate') and an envelope filter. To some people, that's a lot, to others it's just the basics of a board. I always like to have my board with me when I'm playing even if I don't use it; it's nice to know that if whichever band I'm playing with has a 'grateful dead' moment and ends up in an improvised section, then I can use different textures to enhance what we're doing instead of note/rhythm choices.
You know the 2nd law of sod? If you don't take it you'll need it? Just finished a 2 hour reading gig and as I was going straight from work, I didn't take my board. Halfway through one of the numbers I thought "you know what would work really well in this situation? A touch of chorus.
I uppose that serves me right for thinking "ah, it'll be right" but you know, the world didn't end and we finished the set. I can't help feel that I could have sounded better or contributed more though. Next time I'm packing 'board.