I started using MultiMC when the regular launcher kept logging out my accounts after a couple of days. MultiMC fixed the problem. Not long after the standard launcher was changed again (for the worse), so it was nice to already have moved on. :P MultiMC also allows for mods to be installed incredibly easily, which is nice.
A disadvantage is that the world and screenshots folders are separate, but that can be fixed relatively easily by linking the folders together with some CMD magic. :D
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