I ride alone quite often. Depending on conditions, I will scope out a new location to ride. Ill hike for hours and take notes on locations, get pictures for the next huck day. If conditions are rough, I practice in the park. Try to perfect a new grab.
Riding alone takes off the pressure of performance and lets you ride at your own pace.
But sometimes, I will send hard alone. It tightens the margin of error and makes me more focused during the ride. I do enjoy the feeling of watching out for yourself; you know that is something happens, you will have rely on yourself to crawl out of a terrain.