I have also found I see and approach work differently from 4x5 to 8x10. I think there are a whole series of different things that come into play to do that - such as:
The greater level of subtle detail you know you will get in 8x10 vs 4x5.
The difference in viewing the scene. To me there is a huge difference to squinting at the "little" 4x5 GG under the dark cloth and standing back under the dark cloth and viewing the whole scen on something as big as my TV screen - to me it just leads to a different way of seeing the scene.
Different DoF/shutter speed choices etc even if you are using equiveleant focal lengths on each format.
etc
Interestingly I often find I don't chose as wide a lens to shoot the same or a similar scene on 4x5 as I chose in 8x10. I frequently use a 90mm lens in 4x5 for cityscapes and landscapes - yet in 4x5 I often find my 250mm lens is by far wide enough for the same work - or a 210mm at the widest. Subtle differences, but still differences.
Also, this old thread I once started over on the LF list on a similar topic - not sure if it ever cleared anything up, but it threw around some of these ideas
http://largeformatphotography.info/lfforum/topic/497098.html