Correct me if I'm wrong, but the first two minutes is him trying to find an instance of like, a variable or something, and he individually goes into a bunch of files one by one and does a text search, then eventually pulls up a third-party file search tool outside of emacs to do it.
On Jetbrains IDEs I would just hit "shift-shift" and get a project-wide search dialog that searches across all of my files and even tells me what kind each instance of the text string is - variable, class, etc - as I'm typing.
In any case, "M-x helm-projectile-find-file" is the Emacs equivalent of IntelliJ's shift-shift. It's nicely bound to "SPC p f" if you use Spacemacs. You can also search tags (variables, symbols, classes, etc) with "SPC p g". Plus, going for a 3rd party search tool is personal preference, Emacs can also do that.
I'm a heavy user of both Spacemacs and IntelliJ, and while the quick search interface of IntelliJ is awesome, Emacs also has this functionality. I assume Jonathan's problem in that video is due to poor language tooling, plus his personal workflow preferences.
I find Jon enraging, especially when he whines about Emacs: a number of the things he complains about are either fixed in newer versions of Emacs (he's still on Emacs 23) or packages offer a vastly improved user experience.
Impresive as a developer but not as an emacs power user.
One thing that makes me very nervous is seeing someone moving the pointer char by char. Do yourself a favor, learn how to jump around!
