I main a sorc for healing and totally agree with you, good arena teams will force an Operative healer to cast heals (addresses the energy management issues), and roll is basically useless.
I do think they still have a bit much in the utility department - an increased CD on their 4 second stun, disable conceal in arena, and all instant aoe mezzes should be reduced/removed.
I agree with that. I can see taking/toning down my flashbang if they did something with intimidating roar
edit: Cut the mez time in half but let concealment have it in their tree where it gets the full length because God knows they need every little bit of help.