This time of year is when you find yourself unable to read the map at some unexpectedly early hour as darkness falls on you. Not to mention a season when wind frequently makes paper maps hard to use!
When I lived in Sheffield I'd get caught out every autumn somewhere up in the Peaks, and find myself running some way (I was 30-ish and in good health) just to get onto the Pennine Way and an easily-navigable-in-the-dark route down, usually to one of the Hope Valley stations such as Edale.
On an unrelated note, I particularly enjoyed Kinder and Bleaklow in the swirling mists without map or compass. It could conjure a fleeting illusion of some kind of remoteness from mankind.