For LF I just mounted straight to the tripod. For mf I use a hasslblad QR that mounted straight to the tripod. I've found if the tripod has a spinning center column it's very easy and fast to mount the camera.

I will also normally position the camera so the lens and the front leg are pointing in the same direction. It makes it easer for leveling.

I've yet to ever have a situation where I needed a head. Yes some would have been faster to setup but never needed one. I like the extra stabality, as I'm normally shooting in the seconds range.