Multi-sock-shoe-overboot systems kill alot of time. One pair of winter shoes addresses this.
Helmet liners and glasses and Balaclavas took forever. Now the insulated fullface and goggles stay together until I need to wash them.
Also for baselayers: If the garment is inside out, and it can be functionally worn inside out, I wear it it inside out. I wasted a lot of time until this thought occurred to me.