Haven't played a round by myself but so far I always end up alone at the driving range/practice green.
I enjoy the comraderie of another player personally and unlike SirMilton have found that having someone to bounce ideas off is quite helpful (I am an amateur car racer). Since moving to FL I have stopped racing now that I have no partner - it was 8hrs of standing around by myself in the heat and making no progress. When I had a partner we could discuss the differnent lines, braking points, etc and elevate each other.
Not to say I won't shoot a round solo, just haven't yet.