I eagerly look forward to a steaming hot cup of my favourite beverage tomorrow.
Pros
More regular energy
More calm
Better listener
Cons
Flatness without it
Gets ideas flowing
A jolt of energy on demand
Update:
October 3, 2014 - As an update to this post.  For the past several months I have been cutting my caffeine intake by having what's called a half-caf.  It is coffee that is half decaf and half regular.  At home I pre-mix my beans before grinding.  Most places I go to are able to accomodate the request.  It is really easy to do and I would recommend it!