I had another one yesterday making huge quantities of cupcakes for my daughter's birthday. I lined and sprayed all my pans and went to get a spoon to attempt to neatly fill the cups, knowing that after a few it would go completely to hell (I'm saying hell a LOT today...) and I would be cleaning the pans in a futile attempt to end up with clean liners. And don't get me started on trying to dispense the batter evenly. ANYWAY, I had an "ah ha!" moment and did this:
Do you see the stroke of brilliance? I scraped the batter into a gallon Ziploc bag, cut off the corner and used it like a pastry bag to easily fill my liners cleanly and evenly! Duh!