Any time
I'm using MultiMC almost exclusively now because it is even more user friendly than MagicLauncher is. No, really... it's as easy as drag-and-drop. The only thing it doesn't do for you is blockID conflict resolution.#7 is silly. MagicLauncher is about as user-friendly and obvious as they get.
However, you are right, MagicLauncher takes a LOT of sting out of modding, making it very easy to have multiple mod setups in a drop-down menu.