Preventing repeated use of hjkl movement keys in vim

One thing I've found that works is :noremap jj <nop>. Vim will delay the j motion because it thinks you might be extending it, which slows you down enough to try something else. You also can't hold the j key down anymore because it just triggers the nop instead. You can still use the button in emergencies, but it's frustrating enough to make you avoid it in the day-to-day editing.

You listen to other people waaay too much. Just use for movement whatever keys you like best, and leave other keys alone. Remapping hjkl keys is somewhat troublesome, and best not done, because they're hardcoded in vim due to historical reasons.