as per a previous thread i'm in the process of joining a big 4 firm, but currently in a sort of consulting/outsourcing role.
i had a real culture shock when moving from industry - the level of networking that's required is much greater. i've always had a "keep your head down and your mouth shut" approach and don't like to bother senior figures unless i have to. however that doesn't work in consulting as those senior figures start to regard you as arrogant when you don't make a conscious effort to engage them.
there is a fine line between networking and brown nosing that i don't like to cross, but i'm definitely seeing the benefits of going out of my way to connect with people even if i don't necessarily need something from them.