To me, a journeyman racer is someone who is with a different team just about every other season, may win a race or two, but without ever being in serious contention for a world championship.

De Cesaris springs to mind here, as do Boutsen, Alesi, Heidfeld, Herbert, Brundle, Trulli or Fisichella.

Drivers like Hill or Button, who have won a championship or have at least come agonizingly close (Massa, Webber) , do not meet the journeyman criteria, IMO.