On my way back home from work theres a convenient store where I pick up some groceries, however its not a supermarket and the prices are too high to do regular shopping. I fit a few things in my backpack each day knowing I can easily get more items the next day. I really don't like the idea of carrying a lock and bike rack and panniers everyday to do errands. I leave that for the weekends (usually early saturday so I have the rest of the weekend).

The most dreaded errand was laundry, since I live in a place with no washer/dryer, and the closest clean laundromat is a 1.5 miles away. Too much trouble, so I just got a wonder washer online and small spin dryer (carried both on my bike, they are small and perfect for a single person). Maybe its laziness but its a lot more convenient for me. I like riding, but not with heavy loads.
I have a touring bike so while I could just keep the rack on at all times, I like going faster and travelling lighter.

Errands are a drag.