Actually, Nox, the excitement factor quickly disappears with experience.
Sort of.
The "excitement" (in the form of fear) that comes from getting in over your head, diminishes as a rider's skill level improves. The threshold at which the circumstances trigger appropriate fear responses, moves higher and higher as a rider's skill level increases. The actual enjoyment of riding, also increases as a rider's skill level increases.
I try to avoid using the word "experience" in that context, because experience merely indicates the passage of time- experience does not directly correlate to any particular level of skill.
The late Peter Lenz had a great deal of skill, after only riding for a few years. In the following video, Peter is on a 22-horsepower motorcycle with a top speed of only 90 mph. He is being filmed by the track record holder on a four-cylinder Supersport, who repeatedly spins up the rear tire trying to keep up with Peter (at 3:09 and again at 4:07 into the video). Peter made over 300 passes this day, mostly against 600, 750, and 1000 class sporting motorcycles, and he was on tires that had been torched for over 400 laps. I like the part at the end, where he gets a tow from one of the riding coaches, and immediately starts plotting a solution around him:
https://www.youtube.com/watch?v=kU6xrs7SOCc
I was always impressed by Peter's maturity as a racer. His ability to assess in three dimensions, and to plot and execute passes, was truly impressive. He would have been the next Valentino Rossi.
But at the other end of the spectrum, a lot of motorcyclists on Harleys have never learned how to ride- once they managed to figure out through trial and error how to operate the clutch well enough to get the motorcycle rolling without stalling the engine, they just stopped learning. They mistake the passage of time as a progression of their skill level, when in reality what is really happening is simply that they are getting more and more comfortable with not knowing how to ride. Those are the guys that when they are told that they don't know how to ride, get all butt-hurt and angrily respond by claiming that they've been "riding" for 50 years or whatever.