I just noticed that I missed this question, and I figured I'd answer it seperately.
I have spent many nights at Jellyrolls all by myself, and I have always had a blast. When I'm by myself, I'll usually sit on a bar stool in the back, but I know my friends have sat at tables up front by themselves in the past. I have met some really nice folks at Jellyrolls, and enjoyed spending time chatting with other people at the bar. The servers are all wonderful, too.
I have had one problem with some sleezeball hitting on me and bothering to the point where I had to get someone to walk me out of the bar at the end of the night, but overall, I have felt really safe and comfortable going there as a single woman by myself. I have always felt comfortable walking back to my resort if I'm staying at an Epcot resort when the bar closed, or heading to the main door of the Boardwalk to catch a cab if I am staying elsewhere.
When's your trip? Maybe it will overlap mine, and you can meet me there
Karen