On Gilg it's a toss up for Tank or Healer in need, rarely see DPS but it can happen. Yes their system swaps so fast sometimes that it doesn't display correctly but that's not proof that healers are more in need as I've had the reverse happen.
Healer in need, que as healer, 5 min wait, swap to Tank, instant pop.
At the very start of ShB with all the healer Drama, yes Healer in need seemed to be more present, but two or so weeks after launch things went back to normal.