I decided to do a quick trip yesterday. I haven't been reading the message boards, so I was really surprised when I saw the Single Rider sign at Space. Of course, I had to come back here to see if it had been posted ;-)
Interestingly, when our party of 3 rode Space, they did not seat a Single Rider with us. However, when we rode BTM...they *did* put someone in with my husband. We were really surprised...my husband was shocked when some woman got in the car next to him and pulled the lap bar down. We have visited the parks several times per year for the past 7 years or so, and have never had that happen.