De-icing operations, cold weather taxi on sloppy tarmac or in cold precip require flaps UP. Also for our group, cold weather flap cycling (0-40-0) is always done before taxi.
Slow throttle application is also SOP around slushy macadam and on or near the deice station, although if applied too slowly, I believe one ends up throwing more wash than if the levers are brought up smartly.