What people like about VS is just how integrated everything is. You can replicate most of the functionality but there is a lot to be said for 'just works' when your in the middle of crunch time.
One of the great things Visual Studio has is the ability to set breakpoints in JavaScript code just like you can for C# code. Not that you can't do that in Eclipse, but it works out of the box vary easily. It's tightly integrated with TFS which let's you check in code resolve bugs in a single step. That way if a similar bug crops up later you can find what the problem was last time and how it was fixed vary quickly. It's also got a vary nice debugger that let's you do things like change values at run time.
One of the great things Visual Studio has is the ability to set breakpoints in JavaScript code just like you can for C# code. Not that you can't do that in Eclipse, but it works out of the box vary easily. It's tightly integrated with TFS which let's you check in code resolve bugs in a single step. That way if a similar bug crops up later you can find what the problem was last time and how it was fixed vary quickly. It's also got a vary nice debugger that let's you do things like change values at run time.