What dishes do you need in order for it to really feel like Thanksgiving?

Oh yes, stuffing with gravy. I prefer stuffing, but dressing baked outside the bird is good too. Got to have the sage though.

Only four things for me:

Thanksgiving must have turkey, mashed potatoes, gravy, and green bean casserole.

All other things are expendable. In fact, I can do without anything else…but those four things define Thanksgiving dinner for me.
Give me a Thanksgiving with those (with other dishes or just those four alone) and I’m happy.

Turkey (I don’t even eat it always, but it would be very odd for it not to be there), stuffing/dressing, cranberry sauce, real potatoes of some kind or other, sweet potatoes of some kind or other.
For me, everything else is pretty negotiable. Most of my family would insist on greens.