We rely INTENSELY on habits because they require so much less energy than consciously pondering and planning everything out. Our daily walking route goes past the main places we may want to go (post office, library, thrift shop, grocery store), so we're more easily able to ship orders, get food, etc. We keep the same food so our basic planned recipes can be easily made without "oh shit I need bread," "oh shit how do I get the bread," mental pileups of despair.

If we didn't have habit chains, we would never get ANYTHING done while episode-hungover. We would have long since starved to death.