There are so many reasons that this hobby has become life centering for me; predominately in that it takes on many forms: commuting, exercise, endurance, competition, camaraderie. Each can be a one time thing, or taken on a sole purpose.
Developing the ultimate commuter bicycle is a long process; taking years of trial and error and possibly costing thousands (10s of thousands) of dollars. The same can be said for each of the others... but binding them all together is the camaraderie you feel with those you spend your time with.
Enjoy those moments out on the road; they are fleeting! Help others find the joy too!