I've been using Unix (and mainly Linux) for 20+ years as well. First using bash, then zsh the last couple of years and I recently switched to fish. The switch was fairly effortless and it took maybe 2 days to not even notice the differences anymore. I do have to look up some things now and then but overall it has been an improvement.

What I like about fish shell is the same why I use the i3 tiling window manager. It has sane defaults and it clicks with how expect things to work, how I would design them. Sane defaults mean a minimal config file so it's easy to look up problems and change things.

I'd at least try it out if I were you.