During off times, you won't have any issues getting a gondola to yourselves. I have asked to have my own and it wasn't an issue. They are one right after another so it's not like people have to wait long for the next one.
We are a family of 4 and we have only been put on with people if there's a group of 2 in front or behind us. We have never been put on we another family of 4 or more.