Here's a great snippet of Kenn Kaufman's take on casual birding, via Chron.com.
It's quite true that a casual interest is a good companion to life - especially if the casual interest is in birds/birding/the natural world. It's when things get a bit more focused, intense, and unforgiving that it requires a shift of perspective and a support group. Unfortunately, the support group occasionally turns into carpooling options and actual support... but it could be worse. I digress.
Casual birders, rock on!