Small quality-of-life wins that made you better

Mine was moving defensives next to movement keys and adding a weak sound for personal cooldowns. It sounds tiny, but it stopped me from dying with everything available.

Nameplate cast bars with important casts colored differently changed dungeons for me. Interrupts stopped being guesswork.

The boring answer is consistent keybinds across alts. Kick, dispel, movement, healthstone, and defensive should live in the same neighborhood on every character.