I too have Protect only as third after CS and Swiftcast. How I see it, especially on lower level content it only makes the healers job slight easier. Not putting it on the party I only marginally increase my own workload but if no one keeps dying or even getting close to it, it's not really vital. Quitting over it, or lack of it thereof, only shows the person had very narrow view of the game mechanics.
(Reminds me of one old WoD run, someone complained "gasp, both healers in CS" my answer "is anyone of you taking damage?" To which he admitted that no, no one in particular was in need of heals. Me and the other heal were swift to turn to heal mode if necessary.)