I do the majority of my road riding on my own and I enjoy it. Its a time for me to unwind and enjoy the peace (three sons dont equal peace and quiet).
Its my form of meditation.

When I have ridden with others (really only on charity rides) I have enjoyed being with other riders and feeling that comraderie.

I always mountain bike with another rider but thats a different thing from road riding - no meditating on single track. I enjoy the chance to discuss the technical parts of the ride and how to nail them.

I would like to try club riding one day maybe when I go home as all the clubs around here are a little too fast for me.