My mind is truly blown now. Not only is the Environment variables resizeable [1], but the Path window is no longer a long list of ; separated strings that you pretty much needed to copy into an external editor to do anything with.

Now, as of Windows 10 preview 10565, there's an actual UI for editing it. 

Wowwwww.

[1] https://plus.google.com/+ArtemRussakovskii/posts/h1En1s5abJs.
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