I went through the install process on windows.
First it said I need to install gvim first. So I did that. then set the path to gvim.exe
Then I was able to install it, and it said just start gvim and plugins will install automatically.
So I start gvim and nothing happens. Looks like normal gvim.
Can you verbalize what significant thing you're missing from Evil that's present in vim?
As a vim user of 25 years before switching to Emacs+Evil, I can name only about two things. And they're not nearly enough for me to go back to vim for.
 - vim's \zs regex pattern, which would let me position the cursor ahead of where the regex match would normally take me without it. This can be very useful for certain macros, but I don't encounter an absolute need for it very often.. but when I do, I wish this was possible in Emacs.
 - In my experience, vim has been much more performant on large files with long lines.. but, again, I don't edit such files often enough to make me want to back to vim... and, anyway, when relatively rare cases when I do need it I can fire up vim for that one use.
Doom emacs is really fast on booting! And you have to open it only once, rest of work you do through emacsclient. I like how fast doom emacs is that sometimes I do unthinkable - I close emacs - just to restart it again.
I'm in the process of converting to emacs after about 6 years of vim - I find just having a daemon launch at startup and always having a frame open is fine once you get into the mindset of sending whatever you're editing to that frame instead of just editing it in the session you're in. I actually kind of prefer it now because when I used vim I never really took advantage of multiple buffers. I'd just open, edit and close.
One thing that's eluded me howver is being able to have graphical and terminal emacs work with the same daemon.
Spacemacs feels really really brittle. Probably not for people familiar with Emacs, but for vim users it (usually) does. I am imagining that this package might feel smoother for a vim user to maintain since it's vim-native
I feel pretty confident with Vim. I tried learning Emacs, got the basic file editing skills, but abandoned the attempt to configure it for my needs.
But when I tried Spacemacs it was just too much. It was completely overwhelming, I didn't understand where anything was, some key-strokes worked like Vim, some worked like Emacs, menus and commands and status lines appeared and disappeared almost at random and in the end I just gave up trying to understand this Rude Goldberg device.
Now, this doesn't mean that Spacemacs is bad - it's entirely plausible that I'm just not to bright and don't have a good attention span to learn this tool. But I don't think that I'm the only one.