Becoming Stupidly Disappointed

^ Terran and protoss require more micro because almost every single useful unit has an activated ability (blink, stim, siege mode, graviton beam to name a few) and also have more caster units like ghosts and high templar. Zerg has.... corruption and infestors. I guess queens too but that's not a combat unit, that's more like chrono boost and mules. Zerg armies naturally require less APM to manage, so even a player with bad multitasking can set up flanks without having to worry about the in-battle micro so much.