Most of my visits are by myself. No one else I know is really interested in the park, nor is anyone I know local.
In my experience, no one really pays any attention to any groups in the park other than their own, so that isn't a personal concern.
Most of my travel has been solo for more than a decade, and honestly, it's great. As has often been said, you get to do what you want when you want, and since I stopped waiting for other people, I've actually done a lot more attractions and travel than I did before. I've just gone and done things I wanted to do rather than waiting for other people to have the money and/or interest to do them with me, and it has really worked out well. And if you've ever had a trip to SDC (or anywhere else) ruined by another person, it's nice to be on a trip where that's not really a possibility!