I have ridden the road all the way myself. There is a lot of nothing out there, but there is also a lot of interesting stuff to see. It is an epic trip that is worth doing in my opinion.
Just finished riding both ways last month. Took almost a month and loved almost every minute of it. Just be careful running the Cajon Pass between the San Bernardino Mountains and the San Gabriel Mountains. It was the most congested and worst riding of the entire trip. Non stop construction and lane diversions with changing road surfaces the entire way, at 80 + MPH !!!
Enjoy the ride, be safe, and let us know what you think of all the " Roadside attractions ". LOL