I have listen/notify on most changes in my database. Not sure I've experienced any performance issue though but I can't say I've been putting things through their paces. IMHO listen/notify's simplicity outweighed the perf gains by WAL.

I'm only sharing this should it be helpful:

  def up do
    whitelist = Enum.join(@user_columns ++ ["tick"], "', '")

    execute """
    CREATE OR REPLACE FUNCTION notify_phrasing() RETURNS trigger AS $$
    DECLARE
      notif jsonb;
      col_name text;
      col_value text;
      uuids jsonb := '{}'::jsonb;
      user_columns text[] := ARRAY['#{whitelist}'];
    BEGIN
      -- First, add all UUID columns
      FOR col_name IN
        SELECT column_name
        FROM information_schema.columns
        WHERE table_name = TG_TABLE_NAME AND data_type = 'uuid'
      LOOP
        EXECUTE format('SELECT ($1).%I::text', col_name)
        INTO col_value
        USING CASE WHEN TG_OP = 'DELETE' THEN OLD ELSE NEW END;

        IF col_value IS NOT NULL THEN
          uuids := uuids || jsonb_build_object(col_name, col_value);
        END IF;
      END LOOP;

      -- Then, add user columns if they exist in the table
      FOREACH col_name IN ARRAY user_columns
      LOOP
        IF EXISTS (
          SELECT 1
          FROM information_schema.columns
          WHERE table_name = TG_TABLE_NAME AND column_name = col_name
        ) THEN
          EXECUTE format('SELECT ($1).%I::text', col_name)
          INTO col_value
          USING CASE WHEN TG_OP = 'DELETE' THEN OLD ELSE NEW END;

          IF col_value IS NOT NULL THEN
            uuids := uuids || jsonb_build_object(col_name, col_value);
          END IF;
        END IF;
      END LOOP;

      notif = jsonb_build_object(
        'table', TG_TABLE_NAME,
        'event', TG_OP,
        'uuids', uuids
      );

      PERFORM pg_notify('phrasing', notif::text);
      RETURN NULL;
    END;
    $$ LANGUAGE plpgsql;
    """

    # Create trigger for each table
    Enum.each(@tables, fn table ->
      execute """
      CREATE TRIGGER notify_phrasing__#{table}
      AFTER INSERT OR UPDATE OR DELETE ON #{table}
      FOR EACH ROW EXECUTE FUNCTION notify_phrasing();
      """
    end)
  end

I do react to most (70%) of my database changes in some way shape or form, and post them to a PubSub topic with the uuids. All of my dispatching can be done off of uuids.