I started using vi in the 90s and got very used to it. It's still my standard text editor (the nvi implementation, that is).

I've never grasped vim. It was too slow at the time and the extended command set consumed all the free keys I use to have available to do my own macros (eg: 'q' 'g').

I reckon vim grew to be much more than an editor, it is now an editing plataform, capable of so many things, and contains lots of shortcuts / builtins for common text-editing situations.

The article above contains many vim-only commands. For example 'di>' ("delete inner angle-block") doesn't exist on standard vi, neither the '>aB' ("indent a Block").