Packer,
I think your views are shared by a lot of people. I'm very lucky that here in Johannesburg it is quite dry, except when it rains! (when it rains, it doesn't so much rain as fall out of the sky - hence you don't want to be riding in it! but it doesn't tend to last long). Therefore I only really intend to use it in the dry (humidity is very low here also).
I also am about 5'10" on a good day, and have a NN Cockpit screen fitted, which I like (and have torbinators as a back up if I put the standard screen back on). I didn't want to go bigger-and-bigger with the screen to stop the buffeting, so went the other way. I like this set-up, though it has had the effect that the wind catches the peak on my Arai Tour X when I do life savers at speed (before I got the Caberg I have used this with a clear visor and sun glasses).
The idea of the flip down visor is great, since I use the bike for work, and have been caught out a couple of times when I've escaped from work late and it has started to get dark

.
I am fortunate that I have a selection of helmets (Arai Tour X, Shoei X8?, Simpson Super Bandit, Kiwi motocross type thingie, Caberg Justissimo).
On a weekend ride, I think I would use the Shoei with a dark visor

(very quiet), for work it's the Caberg for the advantages of the flip front and secondary visor

, if I were going touring, I think I would put the standard screen back on with the Torbinators and would use the Arai Tour X

- I can't think of a time when I would use the Simpson (it has slots on the top to let the rain in, is very noisy, and doesn't have the field of view for like savers - a left over from my GSXR hooligan days I'm afraid

).
So I guess after all the waffle above, it is 'horses for courses'.
Cheers

.