Yup, When nobody has time and I feel like going to a park I just go there by myself. Especially on really quiet days it works perfectly, just keep on riding coasters with my mp3-player on. Barely getting off the coaster. xD
On busier days it occasionally ends up with a conversation with some random people in the queue. Or I end up meeting some other friends, who aren't rollercoaster addicts, but just happen to be in that park that day... (Yes, I've had that various times.
)