This is highly dependent on the kind of work you do as a developer. A lot of times I'm just using one monitor and switch between windows and that's fine. Edit s

This is highly dependent on the kind of work you do as a developer. A lot of times I'm just using one monitor and switch between windows and that's fine. Edit some text, run a build script, run some tests, commit to git. But when doing some serious debugging, e.g. remote debugging a kernel mode driver on a virtual machine, using two displays is almost mandatory.