Hope you had at least a pony bottle. I do understand your point that it is somewhat like going to the movie theater by yourself. We are conditioned to view certain activities as shared events. And there is much to commend the buddy system including the obvious "two heads are better than one" awareness during planning and preparation.
Solo diving entails all the usual risks of scuba diving, but they are now bourn entirely on a single diver's shoulders. That means greater responsibility and a higher level of training to equip you for coping with emergencies. I'm still looking to take the SDI solo course. Ironically, it would be more fun to have company! Anyone else interested?
Dive safe, stay wet... avra