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Herein, how do you get the Grandmapocalypse in cookie clicker?
To start the Grandmapocalypse, you must have at least seven Grandma types, and at least seven Grandmas. You will then have access to the Bingo center/Research facility. This will allow you different research/upgrades and eventually the "One Mind" Upgrade.
Similarly, is there an end to cookie clicker? Strategy. The strategy of Cookie Clicker revolves around efficiency and building your CpS. Currently there is no end goal, so victory is impossible. The closest you can come to winning is to simply have a lot of cookies (or at least more than your friends).
Similarly one may ask, is the Grandmapocalypse worth it?
One Mind is definitely worth it. Let's see the positives: Unlocks several upgrades which greatly boost your CPS, especially the CPS coming from grandmas. Allows you to earn several achievements, which boost your CPS indirectly via Milk and Kitten upgrades.
What does one mind do in cookie clicker?
Go through to level 3, pledge while active, wrinklers while leaving the game to run. Stay at One Mind (level 1). This gives you basically the same wrinkler power (they appear slower, but work 100%), plus 2/3 of your rare cookies are Golden ones, not Wrath. This gives you "Frenzy times wrinklers" and other cool combos.