I was in Orlando last May for a trade show. I had to arrive early on Saturday to set up our booth. Unfortunately (or fortunately for me), the truck with all of our materials broke down and wasn't going to be there for another day, so I went to the Magic Kingdom for the day by myself. My DH thought I was nuts, but I wasn't about to sit around a hotel and do nothing all day.
You'll meet people in lines and I'm sure some will strike up a conversation with you. An iPod is a great thing to bring with you. I was able to absolutely everything that I wanted to do, when I wanted to do it. I didn't have anyone's opinions to cater to or please, it was fantastic. You'll have a blast.
Because I went last minute, I didn't have any ADRs. As a person of 1, I wasn't able to get into any of the TS restaurants, but I didn't really try that hard either. I was content with a CS meal for dinner that night. If you do get an ADR, you might want to bring a book to read during dinner.