Only one of the three Elitist Jerks guides recommends not taking it sometimes (the Resto Druid guide), and it warns that that is only for raids and certain raid compositions. I could see this being true for all three specs though even though the Paladin/Shaman ones don't mention it. (Edit: Cerabret brings up a very good point that Shaman heal when they cast Cleanse Spirit, so it is probably not optional for them.)
In general, if a healer is pugging a heroic, they better have that talent. If they have a very rare spec just for raiding, then they can do the daily random with a custom heroic group with a priest friend if they ever need to.