Is it common practice to force particular IDE to developers? Especially for web developers. I imagine my productivity would decrease quite dramatically for some time.
Only the most insane of companies explicitly require the use of a specific editor, but it's easy for the choices of technology to implicitly limit developers to a single IDE. If your project's build system assumes that everyone is using Visual Studio (or Eclipse, or whatever), then using something else is going to either require a lot of switching between them or a lot of extra work on your part.