i naturally make every new brush from nodraw and texture it seperatley.
Then i can make sure my map is very efficient, although it must be stated that over use of nodraw will cause problems.
Dont get lazy and start making usless geometry nodraw thinking it wont matter......
When i look at some other peoples maps i cringe when i see fully textured massive amounts of useless geometry.
Personally I map with dev/ textures, then I replace them every now and then with nodraw. It's more effective if you want to build areas before texturing and see how they look, geometrically, without having to texture.
Also, anything that's merged into something else won't have a face anyway (As if you put nodraw on it), however stuff hanging free will still be textured AND - stuff without nodraw takes compiletime. I replaced around 1500 faces from dev/somewalltexture to nodraw and took off around a minute in compiletime.