Nothing wrong with operative healing in PvP, you just need to manage your energy anTA closely and it's really easy. I've tend to be in the top few on heealing and I've turned so many fights around by keeping people alive with surgical probe, people underestimate it.
The only WZ I think operatives can be a bit useless in is huttball, since we lack utility. If maybe we were given a dash, similar to consulars/inquisitors, that would give concealement's a gap closer and all agents another escape mechanic, but its not really needed, if you know how to play operatives for what they are.