In my childhood home cauliflower cheese was a meal, not a side dish, but I have taken it as a side in a Toby, and it is as rather good. It probably helps that I can't bear lots of gravy, having only a discreet pool inside a Yorkshire pudding.
I could see it with Christmas Dinner, though.
My favourite bits of CD were always the bread sauce, the roast parsnips, the sprouts and the sausagemeat and oatmeal "stuffing", quotation marks because it was never stuffed in anything but baked in the oven like a meat loaf. Mmmmm.