Hi if you have been on a few JY hols, then it is likely that you will have made some new friends and be interested in going on some of the same tours. I have been on 18 JY tours and have made some very good travel buddies over the years; I've travelled with a number of them on different tours but we mix with the rest of the group and certainly do not act "cliquey"! I've done three Travelsphere tours, but JY would be my first choice as I prefer to travel with other single travellers, rather than predominantly with couples, and do not want to share a room.
I really do feel that this topic, which has been discussed on the forum so many times at this stage, is really redundant - as every single JY tour I've been on (without exception), I have seen people who have travelled singly buddy up with another, to form a pair, or small group, within the tour party. Unless the person really wants to keep to themselves, people pair up really quickly - often with the person they sat on the coach or at dinner with, within the first day or two!
Hope this helps - it's just human nature!
All the best,
Bob