It depends on need ,taste and workflow.
I don't rely heavily on chord plugins, but you are right, if your favorite plugins fit your workflow and help you produce good music.
I use UChord for quick ideas from various scales and modes.
Ultimate Midi Plugin has announced the release of another update to its UChord MIDI effect that creates chord progression based on a chord table and rhythm editor.
65% off now.
Version 1.6.7 adds chord cell drag in the chord table.
More information: Ultimate Midi Plugin