This is shameful to admit...
A friend of mine recently bought a goldwing.  First of all it is really, really, really comfy (you all knew that, it's a barca-lounger with an 1800 cc engine).  But it is also surprising agile.  I was truly amazed.  And the engine is no slouch either, the bike accelerates just fine.  Much to my surpise I REALLY LIKE goldwings.
My last roadtrip with this guy I rode about 600 miles over 3 days on my YZF-1000.  It was fun but I can tell you I was a hurting puppy when it was all over.  I was seriously considering buying my friend's old BMW RS until he stupidly let me ride his goldwing.  The BMW is a fine bike, much more comfortable than a sportbike with some nice things like hand warmers etc... but the things I would miss from my sportbike (i.e. smoothness, power and agility) are provided better by the goldwing than the BMW.
Hooligan