The ability of being able to run multiple files at once without having them open in separate windows or tabs; allowing me (and my team) more time working through code problems since we can all work from one window/tab instead than have each file opened separately which would require switching between projects when needed. There are some quirks that make things less convenient such as not letting you edit text while editing another document but this isn't too much an issue if your using only 1 project per session anyway so might just need getting into habit. If looking solely towards coding then there really aren’t many disadvantages other than maybe needing 2 monitors or something like that?