Usually, yes, though they generally have onions and other things in them. It's not that I don't like those things cold, it's that I like my greens uncomplicated by other flavours.
But when I make green salads I try use as many different greens as I have available-- that can be as few as five or six domestic ones this time of year; or as many as twenty, or even more, in summer when there are a lot of wild ones to be forraged and the garden's pumping them out as well.