I walked through the Never Never with a friend just last week and had no problems at all.
At times when I did lose the track, heading closer to the mersey seemed to pick up the track again. It was easy to lose the track through the more open areas, but as soon as the scrub thickens up, we just happened to appear on the track!
In saying that though, good navigation is still needed, especially if things dont go to plan. We used our map on multiple occasions, if only for some reassurance..
Having previously read frank_in_oz's account of searching for the crossing, I was not looking forward to this part, but it just so happened that the track brought us directly to the log crossing, no problems at all!
And yes, its upstream of McCoy Falls. We could hear the falls at the log crossing, which may help.
The log crossing.

- Log Crossing1.jpg (97.25 KiB) Viewed 12878 times
No one we met at Kia Ora or Pelion hut were annoyed at our plan, I'd say they were more interested.
To Bazza, am I disregarding the environment just because I decide to walk part of the OT when a fee is usually required? I have done the Overland track multiple times in winter, and being a local with access to a car, it's easier for me to organise a loop trip from the Walls of J onto the Overland and back, without needing to get picked up and dropped off. And comparing us to forestry companies!!
There are logbooks for walkers entering the Never Never and Lees Paddocks via which we left, so Parks should be aware of how many people do actually use these tracks. I wonder at the ratio of people doing the OT to people going through Never Never..