I know it's only three little plugs to change (two actually, my TV is mono), but think about the time and effort required every time I want to go from Famicom to Neo Geo to Super Famicom... and back! Immeasurable.
So for about $10 I got a 4-way A/V switcher. I have everything plugged in at once, labelled beautifully, and ready to play. No fuss, no muss, just nice clean organized cordage.
No longer will laziness get in the way of me enjoying any game on any system. Well maybe. My beer isn't refilling itself.