I found WebStorm useful too. Only problem is how slow it feels to be (after using visual studio for other development). Listing members of an object by typing a "." (dot) takes for ever. Also, it takes so much of RAM :(.
True - it does take a lot of RAM but it doesn't seem to be too sluggish. Currently I'm working on my laptop (old Dell D830 4GB RAM) with 4 rather big projects open and I don't have any problems.
