The EE line isn't always open--usually first thing in the morning and shortly before closing it doesn't seem like it is open.
I've done the RnRC single-rider line many times, but I avoid it in the afternoon. I've been stuck there way too long. It also depends on who is loading the ride. I've seen some CM's combine groups of 3 and 5 so no single-rider is used. Last week, the single-rider line was out the door one time, but they hadn't queued up many people inside the ride, so it was deceiving. Also last week, I had 2 times through the single-rider where our group of truly 4 people and 2 people rode in the back car together because a group of 5 were the next ones in the regular line. Sometimes when we are riding RnRC on FP+, we make sure we break into odd-numbered groups to help out those single riders.
TT single-rider always seems like a good idea. There just aren't that many parties of 6.