Excellent post, just about all of that applies to me. I commute almost everyday if there's no extreme weather or I have an appointment or something after work. I'm a little OCD about commuting and try not to miss, I average 4+ days per week Mar-Nov. That morning ride really invigorates me and sets the tone for the day...when I don't do it, there's a different negative feeling about things, it's hard to describe. I have a checklist also and make sure my bag is packed the night before.