It's common knowledge that Green Screen effects are commonly used when making movies and TV shows. BUT after watching the video below I'm positive you'll be amazed at how often it really is used.... wow!!
When it comes to using the Green Screen, I always think of Star Trek or a show that is 'heavy' on the science fiction or special effects. What I don't realize or even think of is when a green screen is used for just regular shots that take place on a regular city street scene or building. I guess I always assumed the TV production closes down a city street for the afternoon or film the scene within a soundstage.
The following short video below shows many popular TV shows that use the Green Screen a lot... and I'm guessing more than you even think. :)