As NogDog stated-> "I would think it depends entirely on what sort of web development job you're talking about."
My company is building an expensive web based accounting package that will eventually replace our two for lack of better words - standard accounting packages.
There are probably 20 developers working on the project... Yes, they do a lot of verbal communication between themselves. And they have meetings where many will take turns leading the discussions.
Eventually, the sales, training and implementation teams will get involved...then the support people.
None of the developers will deal directly with the public. But, they may be on standby notice later in the game to assist the sales team if they have a large presentation to do.
Your mileage may vary depending on what you develop and who you develop it for.