I love meeting characters, but as a solo, I find it difficult to do. Often you are invisible. I can't even begin to count how many times people cut right in front of me, like I wasn't there. When families of 8 cut in front of you, even speaking up and trying to be assertive isn't going to help much. You're outnumbered, they got cute kids, they win.
Even when I stand in line and I'm the next to meet the characters, I had the CM look right around me and wave up the people behind me (who always gladly step around me). I guess the CM assumes you're part of the family behind you (but you obvioulsy are not) and the people behind you assume you are with the people in front of you, so they happily step around you when it's suppose to be your turn. So you wind up standing there, skipped and feeling awkward and embarrased. Ugh.

This happened to me at least 4 times last trip.
Even when the CM waves me up for my turn, I also can't count how many times the family behind me runs up to the character in the split second it takes to hand my camera to the CM. Then it becomes awkward while their little kids gets called back to wait their turn. Usually I will just shrug and let them go, or just leave. I get too frustrated sometimes with spending all my energy guarding my spot in line, to the point where I just don't want to bother.
When I do feel like meeting characters, I tend to do lines that are well-monitored, like Epcot's Character Spot.
I used to love meeting characters, but being solo makes it very difficult, and I just don't want to deal with it anymore. Glad to hear everyone else has great experiences - wish I did.