My season is probably 50/50 partner(s)/solo; half playing rounds on a regular basis with customers and playing partners, and half playing at a local course by myself. I really enjoy the rounds that I play alone for some reason, surprising as I consider myself very extroverted (I am energized being around people). There is a course that on Thursdays and Fridays in the summer is generally pretty open around 3; I can get on the course ahead of the couples league that starts at 3:30 and finish and be home by 5:15 - 5:30 for dinner with the family.
When I play a round by myself, I walk, and I think this is what I like the most about my solo rounds. There is no pressure to get the round in under 2 hours (for 9) and I take in more of the outdoors when I am out there walking the course. I'm not zipping around from shot to shot on a cart trying to get through the round. I am still respectful to the rules of golf, and will let others play through accordingly and as necessary. Or I will pass on playing through so that I can slow down a little more, I just make sure that my play is not negatively impacting anyone else's. When I play with customers or my usual partners we play at a good clip and finish our rounds in ~4 hours. But there is just something about the leisurely stroll on the course with my clubs on my back walking to the next shot. Love it.