Most "complex long form shortcuts" that Vim use are one or two keystrokes. Add an extra Escape key for switching between insert and command mode.
The "normal" Ctrl/Shift/Alt/Command/Meta shortcuts are two keystrokes as well.
I think it's a matter of preference and habit. I like not having to move my hands away from the home position of the keyboard when I'm intensely typing. Perhaps some people have much greater accuracy than I do when (for example) moving their hands to press the the arrow keys and then returning to the home position. For me, that distracts me a tiny bit having to spend brain cycles to check whether my hands are in the right spot.
Just sharing a personal anecdote.
Oh btw, why do so many people "love" Vim? It's been around for decades. I'm pretty sure unless you use Emacs, you've changed your main text editor over time. The most popular one today, VS Code, didn't exist a couple years ago. Not sure what people used before that, but IIRC no mainstream text editor was around for so long, on so many different platforms, and in such a consistent manner.
Vim has been around for 30+ years, and I've personally been using Vim for 20+. It's easy to be attached to something if it has been around for so long, and so consistently.
And also, sometimes, maybe, when a creator pours love into a product, the users can feel it. Maybe.