I've checked a lot of answers here for similar questions, but my requirements were different.
Speaking of time, I don't have much time to try out a bunch of IDEs right now let alone get comfortable with them.
-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)
-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.
-Notepad++: Very handy, but still just a text editor
-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.