FFF,
A good point well made! Personally, I think your view can be extended to say that the tools for maintaining the multi-faceted phenomenon of situational awareness are also multi-fold; DR and GPS are probably complementary in the that respect. Personally, I don't equate 'moving map magenta navigation' as situational awareness, I suspect, that if the moving map is seen as situational awareness in its own right, then flying becomes a reactive activity - which is not being situationally aware and will plonk one in trouble sooner or later.
IO540,
The issue of recency is a probable cause in its own right regardless of aircraft, conditions or navigation technique. However, I would suggest that one would have to be very un-recent to let a 100 knoter get away from you to the extent that one wonders into the Heathrow CTR. Recency in my view, is something that merely exacerbates an existing problem, I don't believe it can be the route cause for the issue at large.