This was posted in the national Southern Cruisers forum.  It pretty much sums up the topic:

"But when warm weather finally does come around all those cold snaps and rainstorms are paid in full because a motorcycle summer is worth any price. A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life. We spend all our time sealed in boxes and cars are just the rolling boxes that shuffle us languidly from home-box to work-box to store-box and back, the whole time entombed in stale air, temperature regulated, sound insulated, and smelling of carpets."

Riding on a motorcycle is something that simply has to be experienced.  The baddly overutilized phase "If I have to tell you, you wouldn't understand" says it, but its hackney.  There is just something about feeling the wind, the rain, the sun and directly experiencing it.  Even being in a convertible (or a Jeep without the top) can't compare.