I've checked a lot of answers here for similar questions, but my requirements were different.
Background:
I'm a developer transitioning from traditional compiled languages to modern web-centric languages, the lion's share being JavaScript-focused (Node.js, ExpressJS, Jasmine, etc). Even though I have Visual Studio 2013, and it has most of those features, it's insufficient for my needs out of the box, and quite frankly, buggy so far. E.g., it'll occasionally redline something that actually works.
Speaking of time, I don't have much time to try out a bunch of IDEs right now let alone get comfortable with them.
Requirements:
-Easy/Gentle learning curve. I want to install this thing and get going, not mess around setting up a bunch of custom crap and praying I didn't screw anything up.
-Debugging with good, detailed error reporting
-Free* (for commercial use)
-Windows 10 compatible (Most stuff rated for 8/8.1 seems to work so far)
-Offline version (No 100% cloud apps)
Preferences:
-Customizable UI color schemes for text/background
Stuff I tried that I didn't like, or stuff I'm not down for since it isn't free:
-WebStorm: Not Free. I hear great things about this IDE, here.
-Brackets: Auto-formatting is out of control with this program, and instead of easily changing this within the program/UI, you have to create configuration JSON files? Are you kidding me? Yeah, this definitely fails the learning curve... Stupid overkill.
-Sublime Text 2: Not free, and not javascript friendly out of the box
-Notepad++: Very handy, but still just a text editor
-JavaScript IDE for Eclipse: I still don't know what the hell I have to do to run a simple JS file with this, but I've given up. I don't even care, anymore. Over it.
-Cloud9: Cloud-based IDE. Yeah, no thanks. That's too much control in the hands of my tool instead of the other way around, plus the whole being connected to their cloud requirement. I didn't think it would be an issue until I actually tried it.
-Atom: Most annoying code-completion UX I've ever seen. First I laughed, then I cried.
-Microsoft WebMatrix 3: I couldn't install this on Windows 10, because I couldn't install its pre-reqs on Windows 10. Boo.
* If WebStorm is the difference between night and day with free IDEs, please stress this point. I won't consider it an acceptable answer, but I will take your recommendation seriously and grok on the free vs. premium dilemma.