On my Skills Test my halfway point was a Motorway junction, which I arrived at 400 yards to the left. I mentioned this to the Examiner and said that I was quite happy with that. He then asked what I would do, I said I could side-step over to the junction, then continue as normal, which is what we did.
However the last half of the flight saw us 2 miles to the right of our airfield, so that was not so good. I think we must have had a wind shift, or DI drift..!
I don't think I have ever used DR again, I only ever go on scenic flights, where I might even circle a landmark, if it is interesting enough.
.