On Test Track, single rider is faster, since they seats are in rows of 3. We never use fast pass here. Mission Space no longer has the single rider, it's now the green line for the non moving one.
Now, when we did Everest in July, twice in one morning, we used fast passes twice, and waited no more than 5-10 minutes each time. The single rider people however, did not look like they were moving hardly at all, since the ride seats 2 in each row, so there didn't seem to be as much need for the singles.