Recently I've had the opposite experience, trying to un-customise my Emacs config.

First I've tried mg. Nope, back to Emacs. Then I've tried no init file at all, but the defaults were really driving me crazy.

I've tried Spacemacs in Evil mode. It's an amazing and very polished package, and so many things just make better sense... But the Vi editing style is just not for me, I needed to get stuff done and muscle memory was getting in my way. Next I've tried Spacemacs without Evil, and then Prelude, and both were quite decent, except I was missing maybe half a dozen of my most common tweaks... Like C-x C-a to call align-regexp. When I started copying over just the bits from my old config that I needed the most... And turning off some of the more annoying stuff in Prelude (eg. I dislike both helm and ido)... Look, we're back to square 1.

I went back to my old config that I've been tweaking endlessly for over a decade. I finally feel productive again.